CVE-2026-20005: Cisco Cyber Vision

Medium severity, CVSS 5.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Cyber Vision: version 3.0.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.0.5 only; …
• Cisco Secure Firewall Threat Defense: version 7.6.0 only; version 7.6.1 only; version 7.6.2 only; version 7.6.2.1 only; version 7.7.0 only; version 7.7.10 only; …
• Cisco Snort: from 3.0.0-233, before 3.9.2.0 (fixed in 3.9.2.0)
• Cisco Unified Threat Defense Snort Intrusion Prevention System Engine: version 17.9.4 only; version 17.9.5e only; version 17.12.1a only; version 17.12.2 only; version 17.12.3 only; version 17.12.3a only; …

Published 2026-03-04. Last modified 2026-09-01.