CVE-2026-20054

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20054", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.355Z", "datePublished": "2026-03-04T17:47:05.854Z", "dateUpdated": "2026-03-04T21:30:54.724Z"}, "containers": {"cna": {"title": "Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop 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 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. \r\n\r\nThis vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to enter an infinite loop, causing a DoS condition."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed", "name": "cisco-sa-ftd-snort3-vbavuls-96UcVVed"}], "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."}], "source": {"advisory": "cisco-sa-ftd-snort3-vbavuls-96UcVVed", "discovery": "INTERNAL", "defects": ["CSCwq23372"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Loop with Unreachable Exit Condition ('Infinite Loop')", "type": "cwe", "cweId": "CWE-835"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Cyber Vision", "versions": [{"version": "3.0.0", "status": "affected"}, {"version": "3.0.2", "status": "affected"}, {"version": "3.0.3", "status": "affected"}, 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"5.1.3", "status": "affected"}, {"version": "5.2.0", "status": "affected"}, {"version": "5.2.1", "status": "affected"}, {"version": "5.3.0", "status": "affected"}, {"version": "5.3.1", "status": "affected"}, {"version": "5.3.2", "status": "affected"}], "defaultStatus": "unknown"}, {"vendor": "Cisco", "product": "Cisco Secure Firewall Threat Defense (FTD) Software", "versions": [{"version": "7.2.0", "status": "affected"}, {"version": "7.2.0.1", "status": "affected"}, {"version": "7.2.1", "status": "affected"}, {"version": "7.3.0", "status": "affected"}, {"version": "7.2.2", "status": "affected"}, {"version": "7.2.3", "status": "affected"}, {"version": "7.3.1", "status": "affected"}, {"version": "7.2.4", "status": "affected"}, {"version": "7.2.5", "status": "affected"}, {"version": "7.2.4.1", "status": "affected"}, {"version": "7.3.1.1", "status": "affected"}, {"version": "7.4.0", "status": "affected"}, {"version": "7.2.5.1", "status": "affected"}, {"version": "7.4.1", "status": 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"affected"}, {"version": "7.4.3", "status": "affected"}], "defaultStatus": "unknown"}, {"vendor": "Cisco", "product": "Cisco UTD SNORT IPS Engine Software", "versions": [{"version": "3.17.1S", "status": "affected"}, {"version": "16.12.3", "status": "affected"}, {"version": "Fuji-16.9.5", "status": "affected"}, {"version": "16.12.4", "status": "affected"}, {"version": "17.3.1a", "status": "affected"}, {"version": "16.6.6", "status": "affected"}, {"version": "16.12.2", "status": "affected"}, {"version": "Fuji-16.9.6", "status": "affected"}, {"version": "3.17.0S", "status": "affected"}, {"version": "Fuji-16.9.3", "status": "affected"}, {"version": "Denali-16.3.7", "status": "affected"}, {"version": "Fuji-16.9.2", "status": "affected"}, {"version": "Fuji-16.9.4", "status": "affected"}, {"version": "Everest-16.6.4", "status": "affected"}, {"version": "Everest-16.6.3", "status": "affected"}, {"version": "16.6.5", "status": "affected"}, {"version": "Denali-16.3.5", "status": "affected"}, 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"17.6.1a", "status": "affected"}, {"version": "16.6.10", "status": "affected"}, {"version": "17.7.1a", "status": "affected"}, {"version": "16.12.6", "status": "affected"}, {"version": "Fuji-16.9.8", "status": "affected"}, {"version": "17.6.2", "status": "affected"}, {"version": "17.8.1a", "status": "affected"}, {"version": "16.12.7", "status": "affected"}, {"version": "17.3.5", "status": "affected"}, {"version": "17.6.3", "status": "affected"}, {"version": "17.6.3a", "status": "affected"}, {"version": "17.7.2", "status": "affected"}, {"version": "17.9.1a", "status": "affected"}, {"version": "17.6.4", "status": "affected"}, {"version": "17.10.1a", "status": "affected"}, {"version": "17.3.6", "status": "affected"}, {"version": "16.12.8", "status": "affected"}, {"version": "17.3.7", "status": "affected"}, {"version": "17.9.2a", "status": "affected"}, {"version": "17.6.5", "status": "affected"}, {"version": "17.11.1a", "status": "affected"}, {"version": "17.9.3a", "status": "affected"}, 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"defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-04T17:47:05.854Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-04T21:30:40.990992Z", "id": "CVE-2026-20054", "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": "2026-03-04T21:30:54.724Z"}}]}}

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"version": "17.9.7b"}, {"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-ftd-snort3-vbavuls-96UcVVed", "name": "cisco-sa-ftd-snort3-vbavuls-96UcVVed"}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. \r\n\r\nThis vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to enter an infinite loop, causing a DoS condition."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-835", "description": "Loop with Unreachable Exit Condition ('Infinite Loop')"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-04T17:47:05.854Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20054", "state": "PUBLISHED", "dateUpdated": "2026-03-04T21:30:54.724Z", "dateReserved": "2025-10-08T11:59:15.355Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-03-04T17:47:05.854Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to enter an infinite loop, causing a DoS condition."}, {"lang": "es", "value": "M\u00faltiples productos de Cisco se ven afectados por una vulnerabilidad en la caracter\u00edstica VBA de Snort 3 que podr\u00eda permitir a un atacante remoto no autenticado provocar la ca\u00edda del motor de detecci\u00f3n de Snort 3.\n\nEsta vulnerabilidad se debe a una comprobaci\u00f3n de errores incorrecta al descomprimir datos VBA. Un atacante podr\u00eda explotar esta vulnerabilidad enviando datos VBA manipulados al motor de detecci\u00f3n de Snort 3 en el dispositivo objetivo. Un exploit exitoso podr\u00eda permitir al atacante provocar que el motor de detecci\u00f3n de Snort 3 entre en un bucle infinito, causando una condici\u00f3n de DoS."}], "id": "CVE-2026-20054", "lastModified": "2026-08-20T15:19:41.873", "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-2026-20054", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T21:30:40.990992Z", "version": "2.0.3"}}]}, "published": "2026-03-04T18:16:19.920", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory", "Mitigation"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

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{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.2.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "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": "2026-04-16T13:20:15.165161+00:00", "value": {"mitigation_remediation": ["Install the latest Cisco Secure Firewall Threat Defense software update that includes the fixed Snort 3 VBA decompression logic.", "Disable or remove the Snort 3 VBA feature if it is not required for your deployment to eliminate the attack surface.", "Monitor Snort 3 for abnormal CPU usage or repeated crashes, and block traffic that contains suspicious VBA payloads to prevent exploitation."], "summary": {"action": "Patch", "impact": "Denial of Service (Infinite Loop)"}, "threat_synthesis": {"affected_systems": "The vulnerable products include Cisco Cyber Vision, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco UTD SNORT IPS Engine Software. No specific version numbers are listed, so all current releases are potentially affected until an official patch is applied.", "description_and_impact": "An attacker can trigger an infinite loop in the Snort 3 Detection Engine by sending specially crafted VBA data, which causes the engine to crash. This flaw stems from improper error checking during VBA data decompression and results in a denial\u2011of\u2011service condition on the affected device.", "risk_and_exploitability": "The CVSS score of 5.8 indicates moderate severity, while the EPSS score of less than 1% suggests a very low likelihood of exploitation in the wild. The vulnerability is accessible to unauthenticated remote attackers, and it is not currently listed in the CISA KEV catalog. Due to the nature of the flaw\u2014an infinite loop leading to resource exhaustion\u2014an attacker who succeeds could render the Snort 3 engine unusable, thereby degrading IDS functionality and potentially impacting the overall security posture of the network."}}}}, "created": "2026-03-05T09:06:18.168997+00:00", "updated": "2026-04-16T13:30:16.037963+00:00", "vendors": ["cisco", "cisco$PRODUCT$cisco_utd_snort_ips_engine_software", "cisco$PRODUCT$cyber_vision", "cisco$PRODUCT$secure_firewall_threat_defense"]}