--- id: CVE-2026-20057 title: "Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. \r\n \r\nThis …" summary: "Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. \r\n \r\nThis …" severity: medium cvss: 5.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L' cwe: - CWE-369 vendor: cisco product: snort affected: - 'snort >= 3.0.0-233, < 3.9.3.0' - cyber_vision = 3.0.0 - cyber_vision = 3.0.1 - cyber_vision = 3.0.2 - cyber_vision = 3.0.3 - cyber_vision = 3.0.4 - cyber_vision = 3.0.5 - cyber_vision = 3.0.6 - cyber_vision = 3.1.0 - cyber_vision = 3.1.1 - cyber_vision = 3.1.2 - cyber_vision = 3.2.0 - cyber_vision = 3.2.1 - cyber_vision = 3.2.2 - cyber_vision = 3.2.3 - cyber_vision = 3.2.4 - cyber_vision = 4.0.0 - cyber_vision = 4.0.1 - cyber_vision = 4.0.2 - cyber_vision = 4.0.3 - cyber_vision = 4.1.0 - cyber_vision = 4.1.1 - cyber_vision = 4.1.2 - cyber_vision = 4.1.3 - cyber_vision = 4.1.4 - cyber_vision = 4.1.5 - cyber_vision = 4.1.6 - cyber_vision = 4.1.7 - cyber_vision = 4.2.0 - cyber_vision = 4.2.1 - cyber_vision = 4.2.2 - cyber_vision = 4.2.3 - cyber_vision = 4.2.4 - cyber_vision = 4.2.6 - cyber_vision = 4.3.0 - cyber_vision = 4.3.1 - cyber_vision = 4.3.2 - cyber_vision = 4.3.3 - cyber_vision = 4.4.0 - cyber_vision = 4.4.1 - cyber_vision = 4.4.2 - cyber_vision = 4.4.3 - cyber_vision = 5.0.0 - cyber_vision = 5.0.1 - cyber_vision = 5.0.2 - cyber_vision = 5.1.0 - cyber_vision = 5.1.1 - cyber_vision = 5.1.2 - cyber_vision = 5.1.3 - cyber_vision = 5.2.0 - cyber_vision = 5.2.1 - cyber_vision = 5.3.0 - cyber_vision = 5.3.1 - secure_firewall_threat_defense = 7.2.0 - secure_firewall_threat_defense = 7.2.0.1 - secure_firewall_threat_defense = 7.2.1 - secure_firewall_threat_defense = 7.2.2 - secure_firewall_threat_defense = 7.2.3 - secure_firewall_threat_defense = 7.2.4 - secure_firewall_threat_defense = 7.2.4.1 - secure_firewall_threat_defense = 7.2.5 - secure_firewall_threat_defense = 7.2.5.1 - secure_firewall_threat_defense = 7.2.5.2 - secure_firewall_threat_defense = 7.2.6 - secure_firewall_threat_defense = 7.2.7 - secure_firewall_threat_defense = 7.2.8 - secure_firewall_threat_defense = 7.2.8.1 - secure_firewall_threat_defense = 7.2.9 - secure_firewall_threat_defense = 7.2.10 - secure_firewall_threat_defense = 7.2.10.2 - secure_firewall_threat_defense = 7.3.0 - secure_firewall_threat_defense = 7.3.1 - secure_firewall_threat_defense = 7.3.1.1 - secure_firewall_threat_defense = 7.3.1.2 - secure_firewall_threat_defense = 7.4.0 - secure_firewall_threat_defense = 7.4.1 - secure_firewall_threat_defense = 7.4.1.1 - secure_firewall_threat_defense = 7.4.2 - secure_firewall_threat_defense = 7.4.2.1 - secure_firewall_threat_defense = 7.4.2.2 - secure_firewall_threat_defense = 7.4.2.3 - secure_firewall_threat_defense = 7.4.2.4 - secure_firewall_threat_defense = 7.4.3 - secure_firewall_threat_defense = 7.6.0 - secure_firewall_threat_defense = 7.6.1 - secure_firewall_threat_defense = 7.6.2 - secure_firewall_threat_defense = 7.6.2.1 - secure_firewall_threat_defense = 7.7.0 - secure_firewall_threat_defense = 7.7.10 - secure_firewall_threat_defense = 7.7.10.1 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.1a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.2 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4b - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5b patched: - snort 3.9.3.0 published: '2026-03-04' updated: '2026-08-20' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20057' references: - url: >- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed label: psirt@cisco.com - url: 'https://software.cisco.com' tags: - nvd - csaf - vendor-advisory - cisco epss: 0.00459 epssPercentile: 0.39608 ingestedAt: '2026-08-20T17:59:04.198Z' --- ## Overview Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.    This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a 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 unexpectedly restart causing a a denial of service (DoS) condition. ## Affected - `snort >= 3.0.0-233, < 3.9.3.0` - `cyber_vision = 3.0.0` - `cyber_vision = 3.0.1` - `cyber_vision = 3.0.2` - `cyber_vision = 3.0.3` - `cyber_vision = 3.0.4` - `cyber_vision = 3.0.5` - `cyber_vision = 3.0.6` - `cyber_vision = 3.1.0` - `cyber_vision = 3.1.1` - `cyber_vision = 3.1.2` - `cyber_vision = 3.2.0` - `cyber_vision = 3.2.1` - `cyber_vision = 3.2.2` - `cyber_vision = 3.2.3` - `cyber_vision = 3.2.4` - `cyber_vision = 4.0.0` - `cyber_vision = 4.0.1` - `cyber_vision = 4.0.2` - `cyber_vision = 4.0.3` - `cyber_vision = 4.1.0` - `cyber_vision = 4.1.1` - `cyber_vision = 4.1.2` - `cyber_vision = 4.1.3` - `cyber_vision = 4.1.4` - `cyber_vision = 4.1.5` - `cyber_vision = 4.1.6` - `cyber_vision = 4.1.7` - `cyber_vision = 4.2.0` - `cyber_vision = 4.2.1` - `cyber_vision = 4.2.2` - `cyber_vision = 4.2.3` - `cyber_vision = 4.2.4` - `cyber_vision = 4.2.6` - `cyber_vision = 4.3.0` - `cyber_vision = 4.3.1` - `cyber_vision = 4.3.2` - `cyber_vision = 4.3.3` - `cyber_vision = 4.4.0` - `cyber_vision = 4.4.1` - `cyber_vision = 4.4.2` - `cyber_vision = 4.4.3` - `cyber_vision = 5.0.0` - `cyber_vision = 5.0.1` - `cyber_vision = 5.0.2` - `cyber_vision = 5.1.0` - `cyber_vision = 5.1.1` - `cyber_vision = 5.1.2` - `cyber_vision = 5.1.3` - `cyber_vision = 5.2.0` - `cyber_vision = 5.2.1` - `cyber_vision = 5.3.0` - `cyber_vision = 5.3.1` - `secure_firewall_threat_defense = 7.2.0` - `secure_firewall_threat_defense = 7.2.0.1` - `secure_firewall_threat_defense = 7.2.1` - `secure_firewall_threat_defense = 7.2.2` - `secure_firewall_threat_defense = 7.2.3` - `secure_firewall_threat_defense = 7.2.4` - `secure_firewall_threat_defense = 7.2.4.1` - `secure_firewall_threat_defense = 7.2.5` - `secure_firewall_threat_defense = 7.2.5.1` - `secure_firewall_threat_defense = 7.2.5.2` - `secure_firewall_threat_defense = 7.2.6` - `secure_firewall_threat_defense = 7.2.7` - `secure_firewall_threat_defense = 7.2.8` - `secure_firewall_threat_defense = 7.2.8.1` - `secure_firewall_threat_defense = 7.2.9` - `secure_firewall_threat_defense = 7.2.10` - `secure_firewall_threat_defense = 7.2.10.2` - `secure_firewall_threat_defense = 7.3.0` - `secure_firewall_threat_defense = 7.3.1` - `secure_firewall_threat_defense = 7.3.1.1` - `secure_firewall_threat_defense = 7.3.1.2` - `secure_firewall_threat_defense = 7.4.0` - `secure_firewall_threat_defense = 7.4.1` - `secure_firewall_threat_defense = 7.4.1.1` - `secure_firewall_threat_defense = 7.4.2` - `secure_firewall_threat_defense = 7.4.2.1` - `secure_firewall_threat_defense = 7.4.2.2` - `secure_firewall_threat_defense = 7.4.2.3` - `secure_firewall_threat_defense = 7.4.2.4` - `secure_firewall_threat_defense = 7.4.3` - `secure_firewall_threat_defense = 7.6.0` - `secure_firewall_threat_defense = 7.6.1` - `secure_firewall_threat_defense = 7.6.2` - `secure_firewall_threat_defense = 7.6.2.1` - `secure_firewall_threat_defense = 7.7.0` - `secure_firewall_threat_defense = 7.7.10` - `secure_firewall_threat_defense = 7.7.10.1` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.1a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.2` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.3a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.4b` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.12.5b` ## Remediation Upgrade past the affected range: - `snort 3.9.3.0` ## Vendor advisories - **cisco-sa-ftd-snort3-vbavuls-96UcVVed** · Cisco · affected: Cisco Cyber Vision (51 versions), Cisco UTD SNORT IPS Engine Software (26 versions), Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, … · updated 2026-03-04 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed)