--- id: CVE-2026-20068 title: >- Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspect… summary: >- Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspect… 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-248 vendor: cisco product: snort affected: - 'snort >= 3.0.0-233, < 3.9.2.0' - 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 - cyber_vision = 5.3.2 - 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 = 7.4.0 - 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 = 17.2.1r - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.1a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.2 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.3 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.5 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.6 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.7 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1b - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.2 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1 - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.1a - unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.2 patched: - snort 3.9.2.0 published: '2026-03-04' updated: '2026-08-18' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20068' references: - url: >- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz label: psirt@cisco.com - url: 'https://software.cisco.com' tags: - nvd - csaf - vendor-advisory - cisco epss: 0.00439 epssPercentile: 0.3801 ingestedAt: '2026-08-18T20:22:14.362Z' --- ## Overview Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. An attacker could exploit this vulnerability by sending crafted RPC packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts. ## Affected - `snort >= 3.0.0-233, < 3.9.2.0` - `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` - `cyber_vision = 5.3.2` - `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 = 7.4.0` - `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 = 17.2.1r` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.1a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.2` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.3` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.4a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.5` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.6` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.7` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.3.8a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.1b` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.4.2` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.5.1a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.1a` - `unified_threat_defense_snort_intrusion_prevention_system_engine = 17.6.2` ## Remediation Upgrade past the affected range: - `snort 3.9.2.0` ## Vendor advisories - **cisco-sa-snort3-multi-dos-XFWkWSwz** · Cisco · affected: Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Secure Firewall Threat Defense Virtual, … · updated 2026-03-04 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz)