{"item": {"cve_id": "CVE-2021-1732", "ghsa_id": "", "osv_id": "", "title": "Windows Win32k Elevation of Privilege Vulnerability", "description": "Windows Win32k Elevation of Privilege Vulnerability", "published_at": "2021-02-25T23:15:13.930", "modified_at": "2026-08-12T05:17:32.590", "vendor": "Microsoft", "product": "Windows 10 1803", "affected_versions": ["10.0.0"], "fixed_versions": [], "cvss_score": 7.8, "cvss_version": "3.1", "cvss_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "severity": "HIGH", "epss_score": 0.78376, "epss_percentile": 0.99574, "epss_date": "2026-10-06", "is_kev": true, "kev_date": "2021-11-03", "kev_due_date": "2021-11-17", "kev_action": "Apply updates per vendor instructions.", "cwe_ids": ["CWE-787"], "attack_vector": "LOCAL", "attack_complexity": "LOW", "privileges_required": "LOW", "user_interaction": "NONE", "references": ["http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html", "http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html", "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html", "http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html", "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732"], "source_urls": {"NVD": "https://nvd.nist.gov/vuln/detail/CVE-2021-1732", "CVE.org": "https://www.cve.org/CVERecord?id=CVE-2021-1732", "CISA": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732", "FIRST EPSS": "https://api.first.org/data/v1/epss?cve=CVE-2021-1732"}, "patch_available": null, "workaround_available": null, "sources": ["NVD", "CVE.org", "CISA", "FIRST EPSS"], "reference_items": [{"url": "http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "NVD", "name": ""}, {"url": "http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "NVD", "name": ""}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "tags": ["Patch", "Vendor Advisory"], "source": "NVD", "name": ""}, {"url": "http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.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-2021-1732", "tags": ["Patch", "Vendor Advisory", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732", "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": "2020-12-02T00:00:00.000Z", "ssvc": {"options": {"Exploitation": "active", "Automatable": "no", "Technical Impact": "total"}, "version": "2.0.3", "timestamp": "2021-02-04T00:00:00+00:00", "role": "CISA Coordinator"}, "affected_products": [{"vendor": "Microsoft", "product": "Windows 10 1803", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1809", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1909", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 2004", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 20h2", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 1909", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2004", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2019", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 20h2", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1803", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2019 (Server Core installation)", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1909", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server, version 1909 (Server Core installation)", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 2004", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server version 2004", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 20H2", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server version 20H2", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}], "kev_name": "Microsoft Win32k Privilege Escalation Vulnerability", "kev_short_description": "Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.", "kev_ransomware": "Known", "kev_notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-1732", "kev_cwes": ["CWE-787"], "wordfence_id": "", "mentions_sources": [], "version_match": "unknown", "risk_score": 71, "risk_class": "Critique", "impact": {"confidentialite": "élevé", "integrite": "élevé", "disponibilite": "élevé", "summary": "Un attaquant exploitant cette vulnérabilité pourrait, selon les conditions décrites par les sources, nécessite un accès local, avec des privilèges existants, affecter la confidentialité des données, l'intégrité du système et la disponibilité du service.", "basis": "CVSS 3.1"}, "mechanism": "Écriture hors limites mémoire : l'application écrit au-delà d'une zone prévue, pouvant provoquer un plantage ou un comportement anormal.", "mitigation": {"correction": {"available": true, "text": "Mettre à jour : selon les sources, ne sont plus concernées les versions à partir de Windows 10 Version 1803 publication, Windows 10 Version 1809 publication, Windows Server 2019 (Server Core installation) publication, Windows 10 Version 1909 publication, Windows Server, version 1909 (Server Core installation) publication."}, "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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "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": "Le logiciel peut écrire hors de la zone mémoire prévue, jusqu'au plantage, depuis l'appareil lui-même", "headline_is_derived": true, "action": "Action officielle recommandée par la CISA : Installer les mises à jour publiées par l'éditeur.", "action_kind": "official", "concerned": [{"version": "10.0.0", "state": "hit", "state_label": "Concerné", "todo": "Action officielle recommandée par la CISA : Installer les mises à jour publiées par l'éditeur."}, {"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": "Action officielle recommandée par la CISA : Installer les mises à jour publiées par l'éditeur", "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 : restreindre l'accès à l'appareil", "detail": "L'exploitation demande un accès local à la machine. Limiter qui peut s'y connecter suffit à contenir le risque immédiat.", "duration": "20 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": "Correctif non identifié dans les sources", "affected_label": "10.0.0"}, "severity_display": "Élevée", "cvss_is_legacy": false, "risk_score_computable": true, "identifier": "CVE-2021-1732", "severity_fr": "Élevée", "epss_pct": 78.4, "source_records": [{"source": "NVD", "label": "NVD, NIST", "date_label": "Publié dans la base", "date": "2021-02-25", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1732"}, {"source": "CVE.org", "label": "CVE.org, programme CVE", "date_label": "Publié par l'organisme CNA", "date": "2021-02-25", "url": "https://www.cve.org/CVERecord?id=CVE-2021-1732"}, {"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-2021-1732"}, {"source": "FIRST EPSS", "label": "FIRST EPSS", "date_label": "Score daté du", "date": "2026-10-06", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-1732"}], "exploit_public": true, "reseau_sans_auth": false, "exposition": "Avec un accès à la machine", "owasp": []}, "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 : publication", "source": "Versions publiées comme non concernées"}, {"question": "Comment l'attaquer ?", "ton": "neutre", "reponse": "Avec un accès à la machine", "source": "Vecteur CVSS publié"}, {"question": "Risque d'exploitation", "ton": "alerte", "reponse": "78,4 % 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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "domaine": "portal.msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["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.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732", "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/161880/Win32k-ConsoleControl-Offset-Confusion.html", "domaine": "packetstormsecurity.com", "editeur": "Packet Storm", "etiquettes": ["Code d'exploitation", "Avis d'un tiers", "Base de vulnérabilités"], "nom": "", "lien": false, "casse": false}, {"url": "http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Confusion-Privilege-Escalation.html", "domaine": "packetstormsecurity.com", "editeur": "Packet Storm", "etiquettes": ["Code d'exploitation", "Avis d'un tiers", "Base de vulnérabilités"], "nom": "", "lien": false, "casse": false}]}], "liens_correction": [{"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732", "domaine": "portal.msrc.microsoft.com", "editeur": "Microsoft", "etiquettes": ["Correctif", "Avis de l'éditeur"], "nom": "", "lien": true, "casse": false, "groupe": "correctif", "groupe_titre": "Correctifs et versions corrigées"}], "nb_exploits": 2, "cvss": {"version": "3.1", "vecteur": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "metriques": [{"code": "AV", "nom": "Vecteur d'attaque", "valeur": "Local (accès à la machine)", "brut": "L", "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:L/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-787", "nom": "Out-of-bounds Write", "url": "https://cwe.mitre.org/data/definitions/787.html"}], "owasp": [], "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": "2021-02-04", "role": "CISA Coordinator", "url": "https://www.cisa.gov/stakeholder-specific-vulnerability-categorization-ssvc"}, "chronologie": [{"date": "2020-12-02", "libelle": "Identifiant réservé", "qui": "Programme CVE"}, {"date": "2021-02-04", "libelle": "Décision SSVC publiée", "qui": "CISA"}, {"date": "2021-02-25", "libelle": "Publication de la vulnérabilité", "qui": "microsoft"}, {"date": "2021-11-03", "libelle": "Ajout au catalogue des failles exploitées", "qui": "CISA"}, {"date": "2021-11-17", "libelle": "Échéance de correction fixée par la CISA", "qui": "CISA"}, {"date": "2026-08-12", "libelle": "Dernière mise à jour de la fiche source", "qui": "Source"}, {"date": "2026-10-06", "libelle": "Calcul du score EPSS affiché", "qui": "FIRST"}], "liens_officiels": [{"nom": "NVD (NIST)", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1732", "description": "Fiche de référence : CVSS, CPE, références étiquetées."}, {"nom": "CVE.org", "url": "https://www.cve.org/CVERecord?id=CVE-2021-1732", "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-2021-1732", "description": "Entrée du catalogue des failles activement exploitées."}, {"nom": "FIRST EPSS", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-1732", "description": "Score de probabilité d'exploitation du jour."}, {"nom": "OSV.dev", "url": "https://osv.dev/vulnerability/CVE-2021-1732", "description": "Paquets open source concernés et versions corrigées."}, {"nom": "GitHub Advisory Database", "url": "https://github.com/advisories?query=CVE-2021-1732", "description": "Avis de sécurité des dépendances logicielles."}], "produits": [{"vendor": "Microsoft", "product": "Windows 10 1803", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1809", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 1909", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 2004", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 20h2", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 1909", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2004", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 2019", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows Server 20h2", "ranges": ["toutes versions (selon NVD)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1803", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server 2019 (Server Core installation)", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 1909", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server, version 1909 (Server Core installation)", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 2004", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server version 2004", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows 10 Version 20H2", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}, {"vendor": "Microsoft", "product": "Windows Server version 20H2", "ranges": ["de 10.0.0 à publication (exclue)"], "first_unaffected": ["publication"], "source": "CVE.org"}], "notes_kev": ["https://nvd.nist.gov/vuln/detail/CVE-2021-1732"]}, "consulted_at": "2026-10-06T19:16:39.168833+00:00"}