{"id":"CVE-2026-20053","state":"PUBLISHED","title":"Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability","description":"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 range checking when decompressing VBA data, which is user controlled. 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.","publishedAt":"2026-03-04T17:46:58.213Z","updatedAt":"2026-03-04T21:25:01.489Z","severity":{"score":5.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Cyber Vision","Cisco Cisco Secure Firewall Threat Defense (FTD) Software","Cisco Cisco UTD SNORT IPS Engine Software"],"affected":[{"vendor":"Cisco","product":"Cisco Cyber Vision","defaultStatus":"unknown","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"},{"version":"3.1.0","status":"affected"},{"version":"3.0.4","status":"affected"},{"version":"3.1.1","status":"affected"},{"version":"3.1.2","status":"affected"},{"version":"3.2.0","status":"affected"},{"version":"3.0.5","status":"affected"},{"version":"3.2.1","status":"affected"},{"version":"3.0.6","status":"affected"},{"version":"3.2.2","status":"affected"},{"version":"3.2.3","status":"affected"},{"version":"3.2.4","status":"affected"},{"version":"4.0.0","status":"affected"},{"version":"4.0.1","status":"affected"},{"version":"4.0.2","status":"affected"},{"version":"4.0.3","status":"affected"},{"version":"4.1.0","status":"affected"},{"version":"4.1.1","status":"affected"},{"version":"4.1.2","status":"affected"},{"version":"4.1.3","status":"affected"},{"version":"4.1.4","status":"affected"},{"version":"4.2.0","status":"affected"},{"version":"4.2.1","status":"affected"},{"version":"4.1.5","status":"affected"},{"version":"4.2.2","status":"affected"},{"version":"4.2.X","status":"affected"},{"version":"4.2.3","status":"affected"},{"version":"4.2.4","status":"affected"},{"version":"4.2.6","status":"affected"},{"version":"4.1.6","status":"affected"},{"version":"4.3.0","status":"affected"},{"version":"4.3.1","status":"affected"},{"version":"4.3.2","status":"affected"},{"version":"4.3.3","status":"affected"},{"version":"4.4.0","status":"affected"},{"version":"4.4.1","status":"affected"},{"version":"4.4.2","status":"affected"},{"version":"4.4.3","status":"affected"},{"version":"4.1.7","status":"affected"},{"version":"5.0.0","status":"affected"},{"version":"5.0.1","status":"affected"},{"version":"5.0.2","status":"affected"},{"version":"5.1.0","status":"affected"},{"version":"5.1.1","status":"affected"},{"version":"5.1.2","status":"affected"},{"version":"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"}]},{"vendor":"Cisco","product":"Cisco Secure Firewall Threat Defense (FTD) Software","defaultStatus":"unknown","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":"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","status":"affected"},{"version":"7.6.1","status":"affected"},{"version":"7.4.2.3","status":"affected"},{"version":"7.6.2","status":"affected"},{"version":"7.7.10","status":"affected"},{"version":"7.6.2.1","status":"affected"},{"version":"7.7.10.1","status":"affected"},{"version":"7.4.2.4","status":"affected"},{"version":"7.2.10.2","status":"affected"},{"version":"7.4.3","status":"affected"}]},{"vendor":"Cisco","product":"Cisco UTD SNORT IPS Engine 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Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability","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 range checking when decompressing VBA data, which is user controlled. 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."}],"affected":[{"vendor":"Cisco","product":"Cisco Cyber 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UTD SNORT IPS Engine Software","defaultStatus":"unknown","versions":[{"version":"17.12.1a","status":"affected"},{"version":"17.9.4","status":"affected"},{"version":"17.12.2","status":"affected"},{"version":"17.13.1a","status":"affected"},{"version":"17.12.3","status":"affected"},{"version":"17.14.1a","status":"affected"},{"version":"17.12.4","status":"affected"},{"version":"17.12.3a","status":"affected"},{"version":"17.15.1a","status":"affected"},{"version":"17.16.1a","status":"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","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed","name":"cisco-sa-ftd-snort3-vbavuls-96UcVVed"}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"Heap-based 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