{"item": {"cve_id": "CVE-2021-34527", "ghsa_id": "", "osv_id": "", "title": "Windows Print Spooler Remote Code Execution Vulnerability", "description": "A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\nUPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability.\nIn addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ):\n\nHKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows NT\\Printers\\PointAndPrint\nNoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting)\nUpdatePromptSettings = 0 (DWORD) or not defined (default setting)\n\nHaving NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design.\nUPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates.\nNote that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.", "published_at": "2021-07-02T22:15:08.757", "modified_at": "2026-08-10T20:15:22.807", "vendor": "Microsoft", "product": "Windows 10 1507", "affected_versions": ["10.0.10240.0", "10.0.14393.0", "10.0.17763.0", "10.0.0", "10.0.19044.0", "10.0.19045.0", "10.0.22000.0", "10.0.22621.0", "6.3.0", "6.1.7601.0", "6.0.6003.0", "6.2.9200.0", "6.3.9600.0", "10.0.20348.0"], "fixed_versions": [], "cvss_score": 8.8, "cvss_version": "3.1", "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "severity": "HIGH", "epss_score": 0.99792, "epss_percentile": 0.99956, "epss_date": "2026-10-08", "is_kev": true, "kev_date": "2021-11-03", "kev_due_date": "2022-05-03", "kev_action": "Apply updates per vendor instructions.", "cwe_ids": [], "attack_vector": "NETWORK", "attack_complexity": "LOW", "privileges_required": "LOW", "user_interaction": "NONE", "references": ["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527", "http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html", "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527", "https://www.kb.cert.org/vuls/id/383432", "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-detection-script", "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-mitigation-script", "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527"], "source_urls": {"NVD": "https://nvd.nist.gov/vuln/detail/CVE-2021-34527", "CVE.org": "https://www.cve.org/CVERecord?id=CVE-2021-34527", "CISA": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527", "FIRST EPSS": "https://api.first.org/data/v1/epss?cve=CVE-2021-34527"}, "patch_available": null, "workaround_available": null, "sources": ["NVD", "CVE.org", "CISA", "FIRST EPSS"], "reference_items": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527", "tags": ["Patch", "Vendor Advisory", "vendor-advisory", "patch"], "source": "NVD", "name": ""}, {"url": "http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527", "tags": ["Mitigation", "Patch", "Vendor Advisory", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.kb.cert.org/vuls/id/383432", "tags": ["Third Party Advisory", "US Government Resource"], "source": "NVD", "name": ""}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-detection-script", "tags": ["Exploit", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-mitigation-script", "tags": ["Exploit", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527", "tags": ["US Government Resource", "government-resource"], "source": "NVD", "name": ""}], "cvss_v4_score": null, "cvss_v4_vector": "", "cvss_v4_severity": "", "nvd_status": "Analyzed", "cna": "microsoft", "date_reserved": "2021-06-09T00:00:00.000Z", "ssvc": {"options": {"Exploitation": "active", "Automatable": "no", "Technical Impact": "total"}, "version": "2.0.3", "timestamp": "2024-01-24T16:04:14.042095Z", "role": "CISA Coordinator"}, "affected_products": [{"vendor": "Microsoft", "product": "Windows 10 1507", "ranges": ["avant 10.0.10240.18969"], "first_unaffected": ["10.0.10240.18969"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1607", "ranges": ["avant 10.0.14393.4470"], "first_unaffected": ["10.0.14393.4470"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1809", "ranges": ["avant 10.0.17763.2029"], "first_unaffected": ["10.0.17763.2029"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 20h2", "ranges": ["avant 10.0.19042.1083"], "first_unaffected": ["10.0.19042.1083"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 21h2", "ranges": ["avant 10.0.19044.1415"], "first_unaffected": ["10.0.19044.1415"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 22h2", "ranges": ["avant 10.0.19045.2251"], "first_unaffected": ["10.0.19045.2251"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 11 21h2", "ranges": ["avant 10.0.22000.318"], "first_unaffected": ["10.0.22000.318"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 11 22h2", "ranges": ["avant 10.0.22621.674"], "first_unaffected": ["10.0.22621.674"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Rt 8.1", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2008", "ranges": ["toutes versions (selon NVD)", "r2"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2012", "ranges": ["toutes versions (selon NVD)", "r2"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2016", "ranges": ["avant 10.0.14393.4470"], "first_unaffected": ["10.0.14393.4470"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2019", "ranges": ["avant 10.0.17763.2029"], "first_unaffected": ["10.0.17763.2029"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2022", "ranges": ["avant 10.0.20348.230"], "first_unaffected": ["10.0.20348.230"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 20h2", "ranges": ["avant 10.0.19042.1083"], "first_unaffected": ["10.0.19042.1083"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1507", "ranges": ["de 10.0.10240.0 à 10.0.10240.18969 (exclue)"], "first_unaffected": ["10.0.10240.18969"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1607", "ranges": ["de 10.0.14393.0 à 10.0.14393.4470 (exclue)"], "first_unaffected": ["10.0.14393.4470"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.17763.0 à 10.0.17763.2029 (exclue)"], "first_unaffected": ["10.0.17763.2029"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.0 à 10.0.17763.2029 (exclue)"], "first_unaffected": ["10.0.17763.2029"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 20H2", "ranges": ["de 10.0.0 à 10.0.19042.1083 (exclue)"], "first_unaffected": ["10.0.19042.1083"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 21H2", "ranges": ["de 10.0.19044.0 à 10.0.19044.1415 (exclue)"], "first_unaffected": ["10.0.19044.1415"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 22H2", "ranges": ["de 10.0.19045.0 à 10.0.19045.2251 (exclue)"], "first_unaffected": ["10.0.19045.2251"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 11 version 21H2", "ranges": ["de 10.0.22000.0 à 10.0.22000.318 (exclue)"], "first_unaffected": ["10.0.22000.318"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 11 version 22H2", "ranges": ["de 10.0.22621.0 à 10.0.22621.674 (exclue)"], "first_unaffected": ["10.0.22621.674"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 8.1", "ranges": ["de 6.3.0 à 6.3.9600.20046 (exclue)"], "first_unaffected": ["6.3.9600.20046"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 R2 Service Pack 1", "ranges": ["de 6.1.7601.0 à 6.1.7601.25633 (exclue)"], "first_unaffected": ["6.1.7601.25633"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)", "ranges": ["de 6.1.7601.0 à 6.1.7601.25633 (exclue)"], "first_unaffected": ["6.1.7601.25633"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 Service Pack 2", "ranges": ["de 6.0.6003.0 à 6.0.6003.21138 (exclue)"], "first_unaffected": ["6.0.6003.21138"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 Service Pack 2 (Server Core installation)", "ranges": ["de 6.0.6003.0 à 6.0.6003.21138 (exclue)"], "first_unaffected": ["6.0.6003.21138"], "source": "CVE.org"}], "kev_name": "Microsoft Windows Print Spooler Remote Code Execution Vulnerability", "kev_short_description": "Microsoft Windows Print Spooler contains an unspecified vulnerability due to the Windows Print Spooler service improperly performing privileged file operations. Successful exploitation allows an attacker to perform remote code execution with SYSTEM privileges. The vulnerability is also known under the moniker of PrintNightmare.", "kev_ransomware": "Known", "kev_notes": "Reference CISA's ED 21-04 (https://www.cisa.gov/news-events/directives/ed-21-04-mitigate-windows-print-spooler-service-vulnerability) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-04. https://nvd.nist.gov/vuln/detail/CVE-2021-34527", "kev_cwes": ["CWE-269"], "wordfence_id": "", "mentions_sources": [], "version_match": "unknown", "risk_score": 78, "risk_class": "Critique", "impact": {"confidentialite": "élevé", "integrite": "élevé", "disponibilite": "élevé", "summary": "Un attaquant exploitant cette vulnérabilité pourrait, selon les conditions décrites par les sources, exploitable à distance (réseau), avec des privilèges existants, affecter la confidentialité des données, l'intégrité du système et la disponibilité du service.", "basis": "CVSS 3.1"}, "mechanism": "Exécution de code à distance : sous certaines conditions, du code peut être exécuté sur le système.", "mitigation": {"correction": {"available": true, "text": "Mettre à jour : selon les sources, ne sont plus concernées les versions à partir de Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029, Windows 10 20h2 10.0.19042.1083, Windows 10 21h2 10.0.19044.1415."}, "mitigation": {"specific": "Aucune mesure de mitigation spécifique confirmée par les sources consultées. Consultez les références officielles pour d'éventuelles mesures détaillées.", "general": ["Maintenir le produit à jour et activer les mises à jour de sécurité.", "Restreindre l'exposition réseau du service au strict nécessaire.", "Appliquer le principe du moindre privilège.", "Surveiller les journaux et les alertes de sécurité."], "specific_links": []}, "containment": {"applicable": true, "actions": ["Action recommandée par la CISA : Apply updates per vendor instructions.", "Isoler ou restreindre l'accès au service concerné.", "Restreindre les flux réseau entrants/sortants liés au composant.", "Renforcer la surveillance des journaux et des accès.", "Désactiver temporairement le composant vulnérable si l'activité le permet."]}, "note": "Priorité aux consignes officielles de l'éditeur et des références. Vérifiez toujours l'avis de sécurité avant toute intervention en production.", "official_links": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527", "groupe": "correctif", "groupe_titre": "Correctifs et versions corrigées", "editeur": "Microsoft", "domaine": "msrc.microsoft.com"}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527", "groupe": "correctif", "groupe_titre": "Correctifs et versions corrigées", "editeur": "Microsoft", "domaine": "portal.msrc.microsoft.com"}]}, "plain": {"verdict": "now", "verdict_label": "Exploité par des attaquants · à traiter aujourd'hui", "verdict_css": "now", "verdict_rank": 0, "headline": "Un attaquant peut faire exécuter son propre code à distance", "headline_is_derived": true, "action": "Mettre à jour vers Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029 ou plus récent, version publiée comme non concernée.", "action_kind": "update", "concerned": [{"version": "Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029 ou plus récent", "state": "safe", "state_label": "Non concerné", "todo": "Rien à faire. Gardez les mises à jour automatiques activées."}, {"version": "10.0.10240.0, 10.0.14393.0, 10.0.17763.0, 10.0.0", "state": "hit", "state_label": "Concerné", "todo": "Mettre à jour vers Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029 ou plus récent, version publiée comme non concernée."}, {"version": "Je ne connais pas ma version", "state": "unknown", "state_label": "À vérifier", "todo": "La version s'affiche généralement dans le menu « À propos » ou « Aide » du logiciel."}], "steps": [{"title": "Sauvegarder avant d'intervenir", "detail": "Une copie récente des données et de la configuration. Si votre hébergeur propose une sauvegarde en un clic, c'est le moment.", "duration": "10 min", "priority": false}, {"title": "Mettre à jour vers Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029 ou plus récent, version publiée comme non concernée", "detail": "C'est la correction officielle. Tant qu'elle n'est pas appliquée, les autres mesures ne sont que temporaires.", "duration": "15 à 45 min", "priority": true}, {"title": "En attendant : réduire l'exposition sur Internet", "detail": "La faille est exploitable à distance. Limiter l'accès au service depuis l'extérieur (pare-feu, filtrage d'adresses, VPN) réduit fortement le risque.", "duration": "30 min", "priority": false}, {"title": "Vérifier que vous n'avez pas déjà été touché", "detail": "Cette faille est activement exploitée. Contrôler les comptes créés récemment, les connexions inhabituelles et les fichiers modifiés depuis la date de publication.", "duration": "30 min", "priority": true}, {"title": "Confirmer que tout fonctionne encore", "detail": "Après correction : page d'accueil, connexion, et les deux ou trois fonctions dont vous vous servez tous les jours.", "duration": "10 min", "priority": false}], "exploited": true, "exploited_label": "Oui, des attaques réelles sont constatées", "fixed_label": "Windows 10 1507 10.0.10240.18969, Windows 10 1607 10.0.14393.4470, Windows 10 1809 10.0.17763.2029 (non concernée selon les sources)", "affected_label": "10.0.10240.0, 10.0.14393.0, 10.0.17763.0, 10.0.0"}, "severity_display": "Élevée", "cvss_is_legacy": false, "risk_score_computable": true, "identifier": "CVE-2021-34527", "severity_fr": "Élevée", "epss_pct": 99.8, "source_records": [{"source": "NVD", "label": "NVD, NIST", "date_label": "Publié dans la base", "date": "2021-07-02", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-34527"}, {"source": "CVE.org", "label": "CVE.org, programme CVE", "date_label": "Publié par l'organisme CNA", "date": "2021-07-02", "url": "https://www.cve.org/CVERecord?id=CVE-2021-34527"}, {"source": "CISA", "label": "CISA KEV", "date_label": "Ajout au catalogue", "date": "2021-11-03", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527"}, {"source": "FIRST EPSS", "label": "FIRST EPSS", "date_label": "Score daté du", "date": "2026-10-08", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-34527"}], "exploit_public": true, "reseau_sans_auth": false, "exposition": "À distance, sous conditions (compte ou action d'un utilisateur)", "owasp": [{"code": "A06", "nom": "Conception non sécurisée", "nom_officiel": "Insecure Design", "slug": "a06-conception-non-securisee", "libelle": "A06:2025 Conception non sécurisée", "url_officielle": "https://top10.owasp.org/2025/A06_2025-Insecure_Design/"}]}, "presentation": {"en_bref": [{"question": "Est-elle attaquée ?", "ton": "alerte", "reponse": "Oui, attaques constatées", "source": "Catalogue CISA KEV"}, {"question": "Existe-t-il un correctif ?", "ton": "bon", "reponse": "Oui : 10.0.10240.18969, 10.0.14393.4470, 10.0.17763.2029, 10.0.19042.1083…", "source": "Versions publiées comme non concernées"}, {"question": "Comment l'attaquer ?", "ton": "neutre", "reponse": "À distance, sous conditions (compte ou action d'un utilisateur)", "source": "Vecteur CVSS publié"}, {"question": "Risque d'exploitation", "ton": "alerte", "reponse": "99,8 % sur 30 jours", "source": "Plus probable que 100 % des failles connues"}], "references": [{"cle": "correctif", "titre": "Correctifs et versions corrigées", "explication": "Les pages que les sources désignent comme correctif ou notes de version.", "items": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527", "domaine": "msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["Correctif", "Avis de l'éditeur"], "nom": "", "lien": true, "casse": false}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527", "domaine": "portal.msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["Mesure de contournement", "Correctif", "Avis de l'éditeur"], "nom": "", "lien": true, "casse": false}]}, {"cle": "avis_tiers", "titre": "Avis d'autorités et d'organismes tiers", "explication": "CERT, agences gouvernementales, bases de vulnérabilités, chercheurs.", "items": [{"url": "https://www.kb.cert.org/vuls/id/383432", "domaine": "www.kb.cert.org", "editeur": "CERT/CC", "etiquettes": ["Avis d'un tiers", "Ressource gouvernementale américaine"], "nom": "", "lien": true, "casse": false}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527", "domaine": "www.cisa.gov", "editeur": "CISA", "etiquettes": ["Ressource gouvernementale américaine", "Ressource gouvernementale"], "nom": "", "lien": true, "casse": false}]}, {"cle": "exploit", "titre": "Codes d'exploitation référencés", "explication": "Les sources signalent un code d'exploitation public. Par prudence, CyberAlert affiche le site qui l'héberge sans lien direct : l'information utile ici est son existence, qui rend la faille plus facile à attaquer.", "items": [{"url": "http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html", "domaine": "packetstormsecurity.com", "editeur": "Packet Storm", "etiquettes": ["Code d'exploitation", "Avis d'un tiers", "Base de vulnérabilités"], "nom": "", "lien": false, "casse": false}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-detection-script", "domaine": "www.vicarius.io", "editeur": "", "etiquettes": ["Code d'exploitation", "Avis d'un tiers"], "nom": "", "lien": false, "casse": false}, {"url": "https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-mitigation-script", "domaine": "www.vicarius.io", "editeur": "", "etiquettes": ["Code d'exploitation", "Avis d'un tiers"], "nom": "", "lien": false, "casse": false}]}], "liens_correction": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527", "domaine": "msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["Correctif", "Avis de l'éditeur"], "nom": "", "lien": true, "casse": false, "groupe": "correctif", "groupe_titre": "Correctifs et versions corrigées"}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527", "domaine": "portal.msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["Mesure de contournement", "Correctif", "Avis de l'éditeur"], "nom": "", "lien": true, "casse": false, "groupe": "correctif", "groupe_titre": "Correctifs et versions corrigées"}], "nb_exploits": 3, "cvss": {"version": "3.1", "vecteur": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "metriques": [{"code": "AV", "nom": "Vecteur d'attaque", "valeur": "Réseau (à distance, y compris par Internet)", "brut": "N", "explication": "D'où l'attaquant doit agir."}, {"code": "AC", "nom": "Complexité de l'attaque", "valeur": "Faible", "brut": "L", "explication": "Conditions hors du contrôle de l'attaquant."}, {"code": "PR", "nom": "Privilèges requis", "valeur": "Faibles (compte ordinaire)", "brut": "L", "explication": "Droits dont l'attaquant a besoin avant d'attaquer."}, {"code": "UI", "nom": "Interaction de l'utilisateur", "valeur": "Aucune", "brut": "N", "explication": "Une victime doit-elle cliquer ou ouvrir quelque chose ?"}, {"code": "S", "nom": "Portée", "valeur": "Inchangée", "brut": "U", "explication": "L'attaque peut-elle toucher d'autres composants que celui qui est vulnérable ?"}, {"code": "C", "nom": "Confidentialité", "valeur": "Élevé", "brut": "H", "explication": "Accès à des informations protégées."}, {"code": "I", "nom": "Intégrité", "valeur": "Élevé", "brut": "H", "explication": "Modification de données ou du système."}, {"code": "A", "nom": "Disponibilité", "valeur": "Élevé", "brut": "H", "explication": "Arrêt ou ralentissement du service."}], "calculateur": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "specification": "https://www.first.org/cvss/v3.1/specification-document"}, "cvss4": null, "cwe": [{"id": "CWE-269", "nom": "Improper Privilege Management", "url": "https://cwe.mitre.org/data/definitions/269.html"}], "owasp": [{"code": "A06", "nom": "Conception non sécurisée", "nom_officiel": "Insecure Design", "slug": "a06-conception-non-securisee", "libelle": "A06:2025 Conception non sécurisée", "url_officielle": "https://top10.owasp.org/2025/A06_2025-Insecure_Design/"}], "ssvc": {"lignes": [{"nom": "Exploitation", "valeur": "Exploitation active constatée", "brut": "active"}, {"nom": "Automatisable", "valeur": "Non : l'attaque ne peut pas être entièrement automatisée", "brut": "no"}, {"nom": "Impact technique", "valeur": "Total : contrôle complet du composant ou de ses informations", "brut": "total"}], "version": "2.0.3", "date": "2024-01-24", "role": "CISA Coordinator", "url": "https://www.cisa.gov/stakeholder-specific-vulnerability-categorization-ssvc"}, "chronologie": [{"date": "2021-06-09", "libelle": "Identifiant réservé", "qui": "Programme CVE"}, {"date": "2021-07-02", "libelle": "Publication de la vulnérabilité", "qui": "microsoft"}, {"date": "2021-11-03", "libelle": "Ajout au catalogue des failles exploitées", "qui": "CISA"}, {"date": "2022-05-03", "libelle": "Échéance de correction fixée par la CISA", "qui": "CISA"}, {"date": "2024-01-24", "libelle": "Décision SSVC publiée", "qui": "CISA"}, {"date": "2026-08-10", "libelle": "Dernière mise à jour de la fiche source", "qui": "Source"}, {"date": "2026-10-08", "libelle": "Calcul du score EPSS affiché", "qui": "FIRST"}], "liens_officiels": [{"nom": "NVD (NIST)", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-34527", "description": "Fiche de référence : CVSS, CPE, références étiquetées."}, {"nom": "CVE.org", "url": "https://www.cve.org/CVERecord?id=CVE-2021-34527", "description": "Enregistrement officiel publié par l'organisme qui a attribué l'identifiant."}, {"nom": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527", "description": "Entrée du catalogue des failles activement exploitées."}, {"nom": "FIRST EPSS", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-34527", "description": "Score de probabilité d'exploitation du jour."}, {"nom": "OSV.dev", "url": "https://osv.dev/vulnerability/CVE-2021-34527", "description": "Paquets open source concernés et versions corrigées."}, {"nom": "GitHub Advisory Database", "url": "https://github.com/advisories?query=CVE-2021-34527", "description": "Avis de sécurité des dépendances logicielles."}], "produits": [{"vendor": "Microsoft", "product": "Windows 10 1507", "ranges": ["avant 10.0.10240.18969"], "first_unaffected": ["10.0.10240.18969"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1607", "ranges": ["avant 10.0.14393.4470"], "first_unaffected": ["10.0.14393.4470"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1809", "ranges": ["avant 10.0.17763.2029"], "first_unaffected": ["10.0.17763.2029"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 20h2", "ranges": ["avant 10.0.19042.1083"], "first_unaffected": ["10.0.19042.1083"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 21h2", "ranges": ["avant 10.0.19044.1415"], "first_unaffected": ["10.0.19044.1415"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 22h2", "ranges": ["avant 10.0.19045.2251"], "first_unaffected": ["10.0.19045.2251"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 11 21h2", "ranges": ["avant 10.0.22000.318"], "first_unaffected": ["10.0.22000.318"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 11 22h2", "ranges": ["avant 10.0.22621.674"], "first_unaffected": ["10.0.22621.674"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Rt 8.1", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2008", "ranges": ["toutes versions (selon NVD)", "r2"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2012", "ranges": ["toutes versions (selon NVD)", "r2"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2016", "ranges": ["avant 10.0.14393.4470"], "first_unaffected": ["10.0.14393.4470"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2019", "ranges": ["avant 10.0.17763.2029"], "first_unaffected": ["10.0.17763.2029"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2022", "ranges": ["avant 10.0.20348.230"], "first_unaffected": ["10.0.20348.230"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 20h2", "ranges": ["avant 10.0.19042.1083"], "first_unaffected": ["10.0.19042.1083"], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1507", "ranges": ["de 10.0.10240.0 à 10.0.10240.18969 (exclue)"], "first_unaffected": ["10.0.10240.18969"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1607", "ranges": ["de 10.0.14393.0 à 10.0.14393.4470 (exclue)"], "first_unaffected": ["10.0.14393.4470"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.17763.0 à 10.0.17763.2029 (exclue)"], "first_unaffected": ["10.0.17763.2029"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.0 à 10.0.17763.2029 (exclue)"], "first_unaffected": ["10.0.17763.2029"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 20H2", "ranges": ["de 10.0.0 à 10.0.19042.1083 (exclue)"], "first_unaffected": ["10.0.19042.1083"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 21H2", "ranges": ["de 10.0.19044.0 à 10.0.19044.1415 (exclue)"], "first_unaffected": ["10.0.19044.1415"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 22H2", "ranges": ["de 10.0.19045.0 à 10.0.19045.2251 (exclue)"], "first_unaffected": ["10.0.19045.2251"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 11 version 21H2", "ranges": ["de 10.0.22000.0 à 10.0.22000.318 (exclue)"], "first_unaffected": ["10.0.22000.318"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 11 version 22H2", "ranges": ["de 10.0.22621.0 à 10.0.22621.674 (exclue)"], "first_unaffected": ["10.0.22621.674"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 8.1", "ranges": ["de 6.3.0 à 6.3.9600.20046 (exclue)"], "first_unaffected": ["6.3.9600.20046"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 R2 Service Pack 1", "ranges": ["de 6.1.7601.0 à 6.1.7601.25633 (exclue)"], "first_unaffected": ["6.1.7601.25633"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)", "ranges": ["de 6.1.7601.0 à 6.1.7601.25633 (exclue)"], "first_unaffected": ["6.1.7601.25633"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 Service Pack 2", "ranges": ["de 6.0.6003.0 à 6.0.6003.21138 (exclue)"], "first_unaffected": ["6.0.6003.21138"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2008 Service Pack 2 (Server Core installation)", "ranges": ["de 6.0.6003.0 à 6.0.6003.21138 (exclue)"], "first_unaffected": ["6.0.6003.21138"], "source": "CVE.org"}], "notes_kev": ["https://nvd.nist.gov/vuln/detail/CVE-2021-34527"]}, "consulted_at": "2026-10-08T15:26:07.811168+00:00"}