{"item": {"cve_id": "CVE-2018-0174", "ghsa_id": "", "osv_id": "", "title": "CVE-2018-0174", "description": "A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.", "published_at": "2018-03-28T22:29:01.233", "modified_at": "2026-06-17T01:30:00.250", "vendor": "Cisco", "product": "Ios", "affected_versions": ["Cisco IOS and IOS XE"], "fixed_versions": [], "cvss_score": 8.6, "cvss_version": "3.1", "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "severity": "HIGH", "epss_score": 0.07608, "epss_percentile": 0.94392, "epss_date": "2026-10-06", "is_kev": true, "kev_date": "2022-03-03", "kev_due_date": "2022-03-17", "kev_action": "Apply updates per vendor instructions.", "cwe_ids": ["CWE-20"], "attack_vector": "NETWORK", "attack_complexity": "LOW", "privileges_required": "NONE", "user_interaction": "NONE", "references": ["http://www.securityfocus.com/bid/103554", "http://www.securitytracker.com/id/1040591", "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04", "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05", "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "https://www.tenable.com/security/research/tra-2018-06", "http://www.securityfocus.com/bid/103554", "http://www.securitytracker.com/id/1040591", "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04", "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05", "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "https://www.tenable.com/security/research/tra-2018-06", "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0174"], "source_urls": {"NVD": "https://nvd.nist.gov/vuln/detail/CVE-2018-0174", "CVE.org": "https://www.cve.org/CVERecord?id=CVE-2018-0174", "CISA": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0174", "FIRST EPSS": "https://api.first.org/data/v1/epss?cve=CVE-2018-0174"}, "patch_available": null, "workaround_available": null, "sources": ["NVD", "CVE.org", "CISA", "FIRST EPSS"], "reference_items": [{"url": "http://www.securityfocus.com/bid/103554", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "source": "NVD", "name": ""}, {"url": "http://www.securitytracker.com/id/1040591", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "source": "NVD", "name": ""}, {"url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04", "tags": ["Third Party Advisory", "US Government Resource"], "source": "NVD", "name": ""}, {"url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05", "tags": ["Third Party Advisory", "US Government Resource"], "source": "NVD", "name": ""}, {"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "tags": ["Vendor Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.tenable.com/security/research/tra-2018-06", "tags": ["Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "http://www.securityfocus.com/bid/103554", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry", "vdb-entry", "x_refsource_BID", "x_transferred"], "source": "NVD", "name": ""}, {"url": "http://www.securitytracker.com/id/1040591", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry", "vdb-entry", "x_refsource_SECTRACK", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04", "tags": ["Third Party Advisory", "US Government Resource", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05", "tags": ["Third Party Advisory", "US Government Resource", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "tags": ["Vendor Advisory", "x_refsource_CONFIRM", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.tenable.com/security/research/tra-2018-06", "tags": ["Third Party Advisory", "x_refsource_MISC", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0174", "tags": ["US Government Resource", "government-resource"], "source": "NVD", "name": ""}], "cvss_v4_score": null, "cvss_v4_vector": "", "cvss_v4_severity": "", "nvd_status": "Analyzed", "cna": "cisco", "date_reserved": "2017-11-27T00:00:00.000Z", "ssvc": {"options": {"Exploitation": "active", "Automatable": "yes", "Technical Impact": "partial"}, "version": "2.0.3", "timestamp": "2024-11-08T17:23:22.893466Z", "role": "CISA Coordinator"}, "affected_products": [{"vendor": "Cisco", "product": "Ios", "ranges": ["12.2(33)sre7a", "jusqu'à 15.2\\(4a\\)ea5 (incluse)", "jusqu'à 15.2\\(6\\)e0a (incluse)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Cisco", "product": "Ios Xe", "ranges": ["12.2(33)sre7a", "jusqu'à 15.2\\(4a\\)ea5 (incluse)", "jusqu'à 15.2\\(6\\)e0a (incluse)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "n/a", "product": "Cisco IOS and IOS XE", "ranges": ["Cisco IOS and IOS XE"], "first_unaffected": [], "source": "CVE.org"}], "kev_name": "Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability", "kev_short_description": "A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).", "kev_ransomware": "Unknown", "kev_notes": "https://nvd.nist.gov/vuln/detail/CVE-2018-0174", "kev_cwes": ["CWE-20"], "wordfence_id": "", "mentions_sources": [], "version_match": "unknown", "risk_score": 59, "risk_class": "Important", "impact": {"confidentialite": "aucun", "integrite": "aucun", "disponibilite": "élevé", "summary": "Un attaquant exploitant cette vulnérabilité pourrait, selon les conditions décrites par les sources, exploitable à distance (réseau), sans authentification préalable, affecter la disponibilité du service.", "basis": "CVSS 3.1"}, "mechanism": "Validation d'entrée insuffisante : des données non conformes sont acceptées.", "mitigation": {"correction": {"available": false, "text": "Correctif non identifié dans les sources consultées. Appliquer la mise à jour de l'éditeur dès qu'elle est disponible."}, "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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "groupe": "avis_editeur", "groupe_titre": "Avis de sécurité de l'éditeur", "editeur": "Cisco", "domaine": "tools.cisco.com"}]}, "plain": {"verdict": "now", "verdict_label": "Exploité par des attaquants · à traiter aujourd'hui", "verdict_css": "now", "verdict_rank": 0, "headline": "Des données mal vérifiées sont acceptées par Ios, à distance et sans compte", "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": "Cisco IOS and IOS XE", "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 : 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": "Correctif non identifié dans les sources", "affected_label": "Cisco IOS and IOS XE"}, "severity_display": "Élevée", "cvss_is_legacy": false, "risk_score_computable": true, "identifier": "CVE-2018-0174", "severity_fr": "Élevée", "epss_pct": 7.6, "source_records": [{"source": "NVD", "label": "NVD, NIST", "date_label": "Publié dans la base", "date": "2018-03-28", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-0174"}, {"source": "CVE.org", "label": "CVE.org, programme CVE", "date_label": "Publié par 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"vigilance", "reponse": "Non identifié dans les sources", "source": "Vérifier l'avis de l'éditeur"}, {"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": "vigilance", "reponse": "7,6 % sur 30 jours", "source": "Plus probable que 94 % 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "domaine": "tools.cisco.com", "editeur": "Cisco", "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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"www.tenable.com", "editeur": "", "etiquettes": ["Avis d'un tiers"], "nom": "", "lien": true, "casse": false}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0174", "domaine": "www.cisa.gov", "editeur": "CISA", "etiquettes": ["Ressource gouvernementale américaine", "Ressource gouvernementale"], "nom": "", "lien": true, "casse": false}]}], "liens_correction": [{"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3", "domaine": "tools.cisco.com", "editeur": "Cisco", "etiquettes": ["Avis de l'éditeur"], "nom": "", "lien": true, "casse": false, "groupe": "avis_editeur", "groupe_titre": "Avis de sécurité de l'éditeur"}], "nb_exploits": 0, "cvss": {"version": "3.1", "vecteur": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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": "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 cliquer ou ouvrir quelque chose ?"}, {"code": "S", "nom": "Portée", "valeur": "Modifiée (d'autres composants peuvent être touchés)", "brut": "C", "explication": "L'attaque peut-elle toucher d'autres composants que celui qui est vulnérable ?"}, {"code": "C", "nom": "Confidentialité", "valeur": "Aucun", "brut": "N", "explication": "Accès à des informations protégées."}, {"code": "I", "nom": "Intégrité", "valeur": "Aucun", "brut": "N", "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:N/UI:N/S:C/C:N/I:N/A:H", "specification": "https://www.first.org/cvss/v3.1/specification-document"}, "cvss4": null, "cwe": [{"id": "CWE-20", "nom": "Improper Input Validation", "url": "https://cwe.mitre.org/data/definitions/20.html"}], "owasp": [{"code": "A05", "nom": "Injection", "nom_officiel": "Injection", "slug": "a05-injection", "libelle": "A05:2025 Injection", "url_officielle": "https://top10.owasp.org/2025/A05_2025-Injection/"}], "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": "Partiel : contrôle ou informations limités", "brut": "partial"}], "version": "2.0.3", "date": "2024-11-08", "role": "CISA Coordinator", "url": "https://www.cisa.gov/stakeholder-specific-vulnerability-categorization-ssvc"}, "chronologie": [{"date": "2017-11-27", "libelle": "Identifiant réservé", "qui": "Programme CVE"}, {"date": "2018-03-28", "libelle": "Publication de la vulnérabilité", "qui": "cisco"}, {"date": "2022-03-03", "libelle": "Ajout au catalogue des failles exploitées", "qui": "CISA"}, {"date": "2022-03-17", "libelle": "Échéance de correction fixée par la CISA", "qui": "CISA"}, {"date": "2024-11-08", "libelle": "Décision SSVC publiée", "qui": "CISA"}, {"date": "2026-06-17", "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-2018-0174", "description": "Fiche de référence : CVSS, CPE, références étiquetées."}, {"nom": "CVE.org", "url": "https://www.cve.org/CVERecord?id=CVE-2018-0174", "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-2018-0174", "description": "Entrée du catalogue des failles activement exploitées."}, {"nom": "FIRST EPSS", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-0174", "description": "Score de probabilité d'exploitation du jour."}, {"nom": "OSV.dev", "url": "https://osv.dev/vulnerability/CVE-2018-0174", "description": "Paquets open source concernés et versions corrigées."}, {"nom": "GitHub Advisory Database", "url": "https://github.com/advisories?query=CVE-2018-0174", "description": "Avis de sécurité des dépendances logicielles."}], "produits": [{"vendor": "Cisco", "product": "Ios", "ranges": ["12.2(33)sre7a", "jusqu'à 15.2\\(4a\\)ea5 (incluse)", "jusqu'à 15.2\\(6\\)e0a (incluse)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "Cisco", "product": "Ios Xe", "ranges": ["12.2(33)sre7a", "jusqu'à 15.2\\(4a\\)ea5 (incluse)", "jusqu'à 15.2\\(6\\)e0a (incluse)"], "first_unaffected": [], "source": "NVD"}, {"vendor": "n/a", "product": "Cisco IOS and IOS XE", "ranges": ["Cisco IOS and IOS XE"], "first_unaffected": [], "source": "CVE.org"}], "notes_kev": ["https://nvd.nist.gov/vuln/detail/CVE-2018-0174"]}, "consulted_at": "2026-10-07T09:29:34.076190+00:00"}