Vulnerability in Cisco Cyber Vision
CVE-2026-20005
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 parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.
EPSS: 0.005 (40.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.
Affected products
- Cisco Cyber Vision — versions 3.0.4, 3.0.0, 3.0.1
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.6.0, 7.6.1, 7.6.2
- Cisco Utd Snort Ips Engine Software — versions 17.2.1r, 17.3.1a, 17.3.2
- Cisco Cyber_vision — versions 3.0.0, 3.0.1, 3.0.2
- Cisco Secure_firewall_threat_defense — versions 7.6.0, 7.6.1, 7.6.2
- Cisco Snort
- Cisco Unified_threat_defense_snort_intrusion_prevention_system_engine — versions 17.12.1a, 17.12.2, 17.12.3
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20005?
- CVE-2026-20005 is a medium-severity vulnerability in Cisco Cyber Vision, classified under CWE-392. CVSS score: 5.8/10. Published 2026-03-04.
- How severe is CVE-2026-20005?
- Medium severity. CVSS v3 base score is 5.8 out of 10.