CVE-2026-20053

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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 an overflow of heap data, which could cause 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": ["CSCwq23373"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Heap-based Buffer Overflow", "type": "cwe", "cweId": "CWE-122"}]}], "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"}, {"version": "3.0.1", "status": "affected"}, 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"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": "affected", "version": "7.2.6"}, {"status": "affected", "version": "7.4.1.1"}, {"status": "affected", "version": "7.2.7"}, {"status": "affected", "version": "7.2.5.2"}, {"status": "affected", "version": "7.3.1.2"}, {"status": "affected", "version": "7.2.8"}, {"status": "affected", "version": "7.6.0"}, {"status": "affected", "version": "7.4.2"}, {"status": "affected", "version": "7.2.8.1"}, {"status": "affected", "version": "7.4.2.1"}, {"status": "affected", "version": "7.2.9"}, {"status": "affected", "version": "7.7.0"}, {"status": "affected", "version": "7.4.2.2"}, {"status": "affected", "version": "7.2.10"}, 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"affected", "version": "17.9.5e"}, {"status": "affected", "version": "17.12.4a"}, {"status": "affected", "version": "17.15.2c"}, {"status": "affected", "version": "17.12.4b"}, {"status": "affected", "version": "17.15.2a"}, {"status": "affected", "version": "17.12.5"}, {"status": "affected", "version": "17.17.1"}, {"status": "affected", "version": "17.12.5a"}, {"status": "affected", "version": "17.15.3a"}, {"status": "affected", "version": "17.15.3"}, {"status": "affected", "version": "17.12.5b"}, {"status": "affected", "version": "17.12.5c"}, {"status": "affected", "version": "17.15.4"}, {"status": "affected", "version": "17.18.1"}, {"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.12.6"}, {"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 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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 an overflow of heap data, which could cause a DoS condition."}, {"lang": "es", "value": "M\u00faltiples productos Cisco est\u00e1n 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 rango incorrecta al descomprimir datos VBA, que son controlados por el usuario. 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 un desbordamiento de datos en el heap, lo que podr\u00eda causar una condici\u00f3n de DoS."}], "id": "CVE-2026-20053", "lastModified": "2026-08-20T15:26:08.243", "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-2026-20053", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T21:24:52.682489Z", "version": "2.0.3"}}]}, "published": "2026-03-04T18:16:19.607", "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-122"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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"affected", "versions": {"scheme": "semver", "value": "7.2.7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.5.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.3.1.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.8"}}, {"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": "7.2.8.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.9"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.7.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.7.10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "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": "2026-04-16T13:20:43.880396+00:00", "value": {"mitigation_remediation": ["Update to the latest Cisco Secure Firewall Threat Defense and associated software releases that contain the official fix as detailed in the Cisco advisory", "If a patch is unavailable or cannot be applied immediately, disable the Snort\u00a03 VBA feature or restrict its input to prevent the vulnerable code path from executing", "Implement monitoring of the Snort\u00a03 Detection Engine for abnormal crashes or memory\u2011overrun indicators, and create alerts for these events to enable rapid incident response"], "summary": {"action": "Assess Impact", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The flaw affects Cisco products that incorporate Snort\u00a03\u2019s VBA capability, including Cisco Cyber Vision, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco UTD SNORT IPS Engine Software. No specific version numbers are published in the advisory, so organizations should verify whether their deployed firmware or software matches the impacted components described in the Cisco advisory.", "description_and_impact": "The vulnerability stems from improper range checking during the decompression of user\u2011controlled VBA data in Snort\u00a03. This flaw can lead to a heap overflow that crashes the Snort\u00a03 Detection Engine, resulting in a Denial of Service that renders the engine unavailable until it is restarted. The weakness is classified as CWE\u2011122.", "risk_and_exploitability": "The CVSS score of 5.8 indicates a medium severity, and the EPSS score of less than 1\u202f% points to a low likelihood of exploitation in the wild. The vulnerability can be triggered by any remote party that can send crafted VBA data to the detection engine; no authentication is required. Because the defect exploits a heap overflow, a successful attack results only in a crash, not arbitrary code execution. The vulnerability is not listed in the CISA KEV catalog, further suggesting that widespread exploitation has not been observed."}}}}, "created": "2026-03-06T15:18:24.529999+00:00", "updated": "2026-04-16T13:30:16.040899+00:00", "vendors": ["cisco", "cisco$PRODUCT$cisco_utd_snort_ips_engine_software", "cisco$PRODUCT$cyber_vision", "cisco$PRODUCT$secure_firewall_threat_defense"]}