{"item": {"cve_id": "CVE-2025-5777", "ghsa_id": "", "osv_id": "", "title": "NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread", "description": "Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server", "published_at": "2025-06-17T13:15:21.523", "modified_at": "2026-10-07T18:17:14.560", "vendor": "Citrix", "product": "Netscaler Application Delivery Controller", "affected_versions": ["14.1", "13.1"], "fixed_versions": [], "cvss_score": 7.5, "cvss_version": "3.1", "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "severity": "HIGH", "epss_score": 0.99972, "epss_percentile": 0.99978, "epss_date": "2026-10-07", "is_kev": true, "kev_date": "2025-07-10", "kev_due_date": "2025-07-11", "kev_action": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cwe_ids": ["CWE-125", "CWE-908"], "attack_vector": "NETWORK", "attack_complexity": "LOW", "privileges_required": "NONE", "user_interaction": "NONE", "references": ["https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420", "https://citrixbleed.com", "https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/", "https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/", "https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/", "https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/", "https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/", "https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71", "https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/", "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777"], "source_urls": {"NVD": "https://nvd.nist.gov/vuln/detail/CVE-2025-5777", "CVE.org": "https://www.cve.org/CVERecord?id=CVE-2025-5777", "CISA": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777", "FIRST EPSS": "https://api.first.org/data/v1/epss?cve=CVE-2025-5777"}, "patch_available": null, "workaround_available": null, "sources": ["NVD", "CVE.org", "CISA", "FIRST EPSS"], "reference_items": [{"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420", "tags": ["Vendor Advisory"], "source": "NVD", "name": ""}, {"url": "https://citrixbleed.com", "tags": ["Broken Link", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/", "tags": ["Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/", "tags": ["Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/", "tags": ["Press/Media Coverage", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/", "tags": ["Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/", "tags": ["Press/Media Coverage"], "source": "NVD", "name": ""}, {"url": "https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71", "tags": ["Third Party Advisory", "third-party-advisory", "technical-description", "signature"], "source": "NVD", "name": ""}, {"url": "https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/", "tags": ["Third Party Advisory", "media-coverage"], "source": "NVD", "name": ""}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777", "tags": ["US Government Resource", "government-resource"], "source": "NVD", "name": ""}], "cvss_v4_score": 9.3, "cvss_v4_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "cvss_v4_severity": "CRITICAL", "nvd_status": "Undergoing Analysis", "cna": "Citrix", "date_reserved": "2025-06-06T06:14:02.358Z", "ssvc": {"options": {"Exploitation": "active", "Automatable": "yes", "Technical Impact": "total"}, "version": "2.0.3", "timestamp": "2026-08-04T03:55:50.973198Z", "role": "CISA Coordinator"}, "affected_products": [{"vendor": "Citrix", "product": "Netscaler Application Delivery Controller", "ranges": ["de 12.1 à 12.1-55.328 (exclue)", "de 13.1 à 13.1-37.235 (exclue)", "de 13.1 à 13.1-58.32 (exclue)", "de 14.1 à 14.1-43.56 (exclue)"], "first_unaffected": ["12.1-55.328", "13.1-37.235", "13.1-58.32", "14.1-43.56"], "source": "NVD"}, {"vendor": "Citrix", "product": "Netscaler Gateway", "ranges": ["de 13.1 à 13.1-58.32 (exclue)", "de 14.1 à 14.1-43.56 (exclue)"], "first_unaffected": ["13.1-58.32", "14.1-43.56"], "source": "NVD"}, {"vendor": "NetScaler", "product": "ADC", "ranges": ["de 14.1 à 43.56 (exclue)", "de 13.1 à 58.32 (exclue)"], "first_unaffected": ["43.56", "58.32"], "source": "CVE.org"}, {"vendor": "NetScaler", "product": "Gateway", "ranges": ["de 14.1 à 43.56 (exclue)", "de 13.1 à 58.32 (exclue)"], "first_unaffected": ["43.56", "58.32"], "source": "CVE.org"}], "kev_name": "Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability", "kev_short_description": "Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.", "kev_ransomware": "Known", "kev_notes": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 ; https://nvd.nist.gov/vuln/detail/CVE-2025-5777", "kev_cwes": ["CWE-125"], "wordfence_id": "", "mentions_sources": [], "version_match": "unknown", "risk_score": 83, "risk_class": "Critique", "impact": {"confidentialite": "élevé", "integrite": "aucun", "disponibilite": "aucun", "summary": "Un attaquant exploitant cette vulnérabilité pourrait, selon les conditions décrites par les sources, exploitable à distance (réseau), sans authentification préalable, affecter la confidentialité des données.", "basis": "CVSS 3.1"}, "mechanism": "Lecture hors limites mémoire : l'application lit au-delà d'une zone prévue, pouvant divulguer de la mémoire.", "mitigation": {"correction": {"available": true, "text": "Mettre à jour : selon les sources, ne sont plus concernées les versions à partir de Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Application Delivery Controller 14.1-43.56, Netscaler Gateway 13.1-58.32."}, "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 mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "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://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420", "groupe": "avis_editeur", "groupe_titre": "Avis de sécurité de l'éditeur", "editeur": "Citrix", "domaine": "support.citrix.com"}]}, "plain": {"verdict": "now", "verdict_label": "Exploité par des attaquants · à traiter aujourd'hui", "verdict_css": "now", "verdict_rank": 0, "headline": "Le logiciel peut lire de la mémoire qui ne lui appartient pas, à distance et sans compte", "headline_is_derived": true, "action": "Mettre à jour vers Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Gateway 13.1-58.32 ou plus récent, version publiée comme non concernée.", "action_kind": "update", "concerned": [{"version": "Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Gateway 13.1-58.32 ou plus récent", "state": "safe", "state_label": "Non concerné", "todo": "Rien à faire. Gardez les mises à jour automatiques activées."}, {"version": "14.1, 13.1", "state": "hit", "state_label": "Concerné", "todo": "Mettre à jour vers Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Gateway 13.1-58.32 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 Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Gateway 13.1-58.32 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": "Netscaler Application Delivery Controller 12.1-55.328, Netscaler Application Delivery Controller 13.1-37.235, Netscaler Application Delivery Controller 13.1-58.32, Netscaler Gateway 13.1-58.32 (non concernée selon les sources)", "affected_label": "14.1, 13.1"}, "severity_display": "Élevée", "cvss_is_legacy": false, "risk_score_computable": true, "identifier": "CVE-2025-5777", "severity_fr": "Élevée", "epss_pct": 100.0, "source_records": [{"source": "NVD", "label": "NVD, NIST", "date_label": "Publié dans la base", "date": "2025-06-17", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5777"}, {"source": "CVE.org", "label": "CVE.org, programme CVE", "date_label": "Publié par l'organisme CNA", "date": "2025-06-17", "url": "https://www.cve.org/CVERecord?id=CVE-2025-5777"}, {"source": "CISA", "label": "CISA KEV", "date_label": "Ajout au catalogue", "date": "2025-07-10", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777"}, {"source": "FIRST EPSS", "label": "FIRST EPSS", "date_label": "Score daté du", "date": "2026-10-07", "url": "https://api.first.org/data/v1/epss?cve=CVE-2025-5777"}], "exploit_public": false, "reseau_sans_auth": true, "exposition": "À distance, sans compte et sans action d'un utilisateur", "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 : 12.1-55.328, 13.1-37.235, 13.1-58.32, 14.1-43.56…", "source": "Versions publiées comme non concernées"}, {"question": "Comment l'attaquer ?", "ton": "alerte", "reponse": "À distance, sans compte et sans action d'un utilisateur", "source": "Vecteur CVSS publié"}, {"question": "Risque d'exploitation", "ton": "alerte", "reponse": "100,0 % sur 30 jours", "source": "Plus probable que 100 % des failles connues"}], "references": [{"cle": "avis_editeur", "titre": "Avis de sécurité de l'éditeur", "explication": "La parole de l'éditeur du produit : elle fait foi pour savoir quoi installer.", "items": [{"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420", "domaine": "support.citrix.com", "editeur": "Citrix", "etiquettes": ["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": 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"explication": "Arrêt ou ralentissement du service."}], "calculateur": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "specification": "https://www.first.org/cvss/v3.1/specification-document"}, "cvss4": {"version": "4.0", "vecteur": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "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": "AT", "nom": "Conditions d'attaque", "valeur": "Aucune", "brut": "N", "explication": "Conditions de déploiement nécessaires à l'attaque."}, {"code": "PR", "nom": "Privilèges requis", "valeur": "Aucun (pas de compte)", "brut": "N", "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 agir ?"}, {"code": "VC", "nom": "Confidentialité du système vulnérable", "valeur": "Élevé", "brut": "H", "explication": ""}, {"code": "VI", "nom": "Intégrité du système vulnérable", "valeur": "Élevé", "brut": "H", "explication": ""}, {"code": "VA", "nom": "Disponibilité du système vulnérable", "valeur": "Élevé", "brut": "H", "explication": ""}, {"code": "SC", "nom": "Confidentialité des systèmes suivants", "valeur": "Faible", "brut": "L", "explication": "Systèmes touchés par rebond."}, {"code": "SI", "nom": "Intégrité des systèmes suivants", "valeur": "Faible", "brut": "L", "explication": "Systèmes touchés par rebond."}, {"code": "SA", "nom": "Disponibilité des systèmes suivants", "valeur": "Faible", "brut": "L", "explication": "Systèmes touchés par rebond."}], "calculateur": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "specification": "https://www.first.org/cvss/v4.0/specification-document"}, "cwe": [{"id": "CWE-125", "nom": "Out-of-bounds Read", "url": "https://cwe.mitre.org/data/definitions/125.html"}, {"id": "CWE-908", "nom": "", "url": "https://cwe.mitre.org/data/definitions/908.html"}], "owasp": [], "ssvc": {"lignes": [{"nom": "Exploitation", "valeur": "Exploitation active constatée", "brut": "active"}, {"nom": "Automatisable", "valeur": "Oui : l'attaque peut être enchaînée sans intervention humaine", "brut": "yes"}, {"nom": "Impact technique", "valeur": "Total : contrôle complet du composant ou de ses informations", "brut": "total"}], "version": "2.0.3", "date": "2026-08-04", "role": "CISA Coordinator", "url": "https://www.cisa.gov/stakeholder-specific-vulnerability-categorization-ssvc"}, "chronologie": [{"date": "2025-06-06", "libelle": "Identifiant réservé", "qui": "Programme CVE"}, {"date": "2025-06-17", "libelle": "Publication de la vulnérabilité", "qui": "Citrix"}, {"date": "2025-07-10", "libelle": "Ajout au catalogue des failles exploitées", "qui": "CISA"}, {"date": "2025-07-11", "libelle": "Échéance de correction fixée par la CISA", "qui": "CISA"}, {"date": "2026-08-04", "libelle": "Décision SSVC publiée", "qui": "CISA"}, {"date": "2026-10-07", "libelle": "Calcul du score EPSS affiché", "qui": "FIRST"}, {"date": "2026-10-07", "libelle": "Dernière mise à jour de la fiche source", "qui": "Source"}], "liens_officiels": [{"nom": "NVD (NIST)", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5777", "description": "Fiche de référence : CVSS, CPE, références étiquetées."}, {"nom": "CVE.org", "url": "https://www.cve.org/CVERecord?id=CVE-2025-5777", "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-2025-5777", "description": "Entrée du catalogue des failles activement exploitées."}, {"nom": "FIRST EPSS", "url": "https://api.first.org/data/v1/epss?cve=CVE-2025-5777", "description": "Score de probabilité d'exploitation du jour."}, {"nom": "OSV.dev", "url": "https://osv.dev/vulnerability/CVE-2025-5777", "description": "Paquets open source concernés et versions corrigées."}, {"nom": "GitHub Advisory Database", "url": "https://github.com/advisories?query=CVE-2025-5777", "description": "Avis de sécurité des dépendances logicielles."}], "produits": [{"vendor": "Citrix", "product": "Netscaler Application Delivery Controller", "ranges": ["de 12.1 à 12.1-55.328 (exclue)", "de 13.1 à 13.1-37.235 (exclue)", "de 13.1 à 13.1-58.32 (exclue)", "de 14.1 à 14.1-43.56 (exclue)"], "first_unaffected": ["12.1-55.328", "13.1-37.235", "13.1-58.32", "14.1-43.56"], "source": "NVD"}, {"vendor": "Citrix", "product": "Netscaler Gateway", "ranges": ["de 13.1 à 13.1-58.32 (exclue)", "de 14.1 à 14.1-43.56 (exclue)"], "first_unaffected": ["13.1-58.32", "14.1-43.56"], "source": "NVD"}, {"vendor": "NetScaler", "product": "ADC", "ranges": ["de 14.1 à 43.56 (exclue)", "de 13.1 à 58.32 (exclue)"], "first_unaffected": ["43.56", "58.32"], "source": "CVE.org"}, {"vendor": "NetScaler", "product": "Gateway", "ranges": ["de 14.1 à 43.56 (exclue)", "de 13.1 à 58.32 (exclue)"], "first_unaffected": ["43.56", "58.32"], "source": "CVE.org"}], "notes_kev": ["https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420", "https://nvd.nist.gov/vuln/detail/CVE-2025-5777"]}, "consulted_at": "2026-10-08T02:50:42.323482+00:00"}