{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20052", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.355Z", "datePublished": "2026-03-04T17:46:57.096Z", "dateUpdated": "2026-03-04T20:46:43.211Z"}, "containers": {"cna": {"title": "Cisco Secure Firewall Threat Defense Software Snort 3 Memory Management 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": "A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3ssl-FBEKYXpH", "name": "cisco-sa-ftd-snort3ssl-FBEKYXpH"}], "exploits": [{"lang": "en", "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-ftd-snort3ssl-FBEKYXpH", "discovery": "INTERNAL", "defects": ["CSCwn63410"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Access of Memory Location After End of Buffer", "type": "cwe", "cweId": "CWE-788"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Secure Firewall Threat Defense (FTD) Software", "versions": [{"version": "7.4.0", "status": "affected"}, {"version": "7.4.1", "status": "affected"}, {"version": "7.4.1.1", "status": "affected"}, {"version": "7.6.0", "status": "affected"}, {"version": "7.4.2", "status": "affected"}, {"version": "7.4.2.1", "status": "affected"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-04T17:46:57.096Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-04T20:46:35.971901Z", "id": "CVE-2026-20052", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-04T20:46:43.211Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts."}], "id": "CVE-2026-20052", "lastModified": "2026-03-05T19:39:11.967", "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": "Primary"}]}, "published": "2026-03-04T18:16:19.420", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3ssl-FBEKYXpH"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-788"}], "source": "psirt@cisco.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.1.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.1"}}], "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": "2026-04-16T13:20:59.180477+00:00", "value": {"mitigation_remediation": ["Upgrade Cisco Secure Firewall Threat Defense software to the latest version that fixes the Snort 3 SSL packet inspection memory management issue.", "If an immediate software update is unavailable, consider disabling Snort 3 SSL packet inspection on affected firewalls until a patch is applied to mitigate the restart risk.", "Monitor firewall logs for unexpected restarts of the Snort 3 Detection Engine and inspect for anomalous traffic patterns that may indicate attempted exploitation."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Cisco Secure Firewall Threat Defense (FTD) software that includes the Snort 3 Detection Engine with SSL packet inspection enabled. Specific version information is not provided, so all deployments of the affected software are potentially vulnerable until a patch is applied.", "description_and_impact": "A logic error in memory management of the Snort 3 Detection Engine in Cisco Secure Firewall Threat Defense software could allow an unauthenticated remote attacker to cause the engine to restart. The flaw arises when the device performs Snort 3 SSL packet inspection and processes crafted SSL packets sent through an established connection. Exploitation results in a denial of service as the Snort 3 Detection Engine unexpectedly restarts, interrupting the firewall\u2019s packet inspection capabilities. This issue corresponds to CWE\u2011788, insecure memory management.", "risk_and_exploitability": "The CVSS score of 5.8 indicates moderate risk, while the EPSS score of less than 1% suggests a low probability of widespread exploitation. The flaw is not listed in the CISA KEV catalog. The attack requires remote, unauthenticated access to send crafted SSL packets to the firewall; no privilege escalation or local access is needed. Once exploited, the Snort 3 engine restarts, causing a service interruption that can degrade firewall performance for all traffic passing through the device."}}}}, "created": "2026-03-05T09:06:19.071523+00:00", "updated": "2026-04-16T13:30:16.043147+00:00", "vendors": ["cisco", "cisco$PRODUCT$secure_firewall_threat_defense"]}