{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20068", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.357Z", "datePublished": "2026-03-04T17:49:10.781Z", "dateUpdated": "2026-03-04T20:26:35.118Z"}, "containers": {"cna": {"title": "Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. 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{"status": "affected", "version": "17.18.1"}, {"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.12.6"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.15.4c"}, {"status": "affected", "version": "17.12.5d"}, {"status": "affected", "version": "17.18.2"}], "defaultStatus": "unknown"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz", "name": "cisco-sa-snort3-multi-dos-XFWkWSwz"}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet 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"cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.18.1a:*:*:*:*:*:*:*", "matchCriteriaId": "2FFB4BE9-4CC8-49F2-851C-F4EA098BA3AF", "vulnerable": true}, {"criteria": "cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.18.2:*:*:*:*:*:*:*", "matchCriteriaId": "E8759E40-63D2-4FA4-9A40-CB330413798E", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. An attacker could exploit this vulnerability by sending crafted RPC packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts."}, {"lang": "es", "value": "M\u00faltiples productos Cisco se ven afectados por una vulnerabilidad en el motor de detecci\u00f3n de Snort 3 que podr\u00eda permitir a un atacante remoto no autenticado provocar el reinicio del motor de detecci\u00f3n de Snort 3, lo que resultar\u00eda en una interrupci\u00f3n de la inspecci\u00f3n de paquetes.\n\nEsta vulnerabilidad se debe a una comprobaci\u00f3n de errores incompleta al analizar datos de llamadas a procedimiento remoto (RPC). Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes RPC manipulados a trav\u00e9s de una conexi\u00f3n establecida para ser analizados por Snort 3. Un exploit exitoso podr\u00eda permitir al atacante causar una condici\u00f3n de DoS cuando el motor de detecci\u00f3n de Snort 3 se reinicia inesperadamente."}], "id": "CVE-2026-20068", "lastModified": "2026-08-18T18:32:42.913", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20068", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T20:26:24.275257Z", "version": "2.0.3"}}]}, "published": "2026-03-04T18:16:22.330", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

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"affected", "versions": {"scheme": "semver", "value": "7.4.2.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.7.10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.7.10.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.10.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.3"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Cisco Secure Firewall Threat Defense (FTD) Software", "source": "cna", "vendor": "Cisco"}, "product": "secure_firewall_threat_defense", "vendor": "cisco"}], "analysis": {"en": {"generated_at": "2026-04-17T13:05:08.697133+00:00", "value": {"mitigation_remediation": ["Apply the latest Cisco firmware or patch that corrects the RPC parsing error in Snort 3, addressing the missing proper error handling (CWE-248).", "If no patch is immediately available, restrict or disable RPC interfaces that feed the Snort 3 engine, or block non\u2011authorized traffic at the firewall before it reaches those interfaces, thereby mitigating the missing error handling weakness (CWE-248).", "Configure monitoring and alerting to detect unexpected Snort 3 restarts, treat such events as a high\u2011severity incident, and respond promptly."], "summary": {"action": "Apply Patch", "impact": "Denial of Service (service interruption)"}, "threat_synthesis": {"affected_systems": "Affected vendors include Cisco Cyber Vision, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco UTD SNORT IPS Engine Software. All impacted instances incorporate the Snort\u00a03 detection engine; no specific version ranges are supplied in the advisory.", "description_and_impact": "This Vulnerability arises from incomplete error handling during RPC data parsing in the Snort 3 detection engine. When an attacker sends specially crafted RPC packets, the parser can crash, forcing the engine to restart. The resultant restart interrupts packet inspection, effectively denying service to all traffic monitored by the engine. The weakness is identified as CWE-248: Missing Proper Error Handling.", "risk_and_exploitability": "The advisory assigns a CVSS score of 5.8, indicating moderate severity, while the EPSS score is less than 1\u202f% and the issue is not listed in the CISA KEV catalog. The vulnerability can be exploited remotely; an unauthenticated attacker must send crafted RPC packets to a susceptible instance. No escalation of privileges is required, and the primary effect is denial of service through an unexpected engine restart."}}}}, "created": "2026-03-05T09:06:11.611920+00:00", "updated": "2026-04-17T13:15:19.655851+00:00", "vendors": ["cisco", "cisco$PRODUCT$cisco_utd_snort_ips_engine_software", "cisco$PRODUCT$cyber_vision", "cisco$PRODUCT$secure_firewall_threat_defense"]}