What’s Vulnerable › Vulnerabilities
CVE-2026-20068: Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability
- Severity: medium (CVSS 5.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-08-18
- Weakness: CWE-248
Description
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 products
- Cisco Cyber Vision: 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5 (+47)
- Cisco Firepower Threat Defense Software: 7.2.4, 7.2.4.1, 7.2.5, 7.2.5.1, 7.2.5.2, 7.2.6 (+22)
- Cisco Snort: from 3.0.0-233 before 3.9.2.0 — fixed in 3.9.2.0
- Cisco UTD SNORT IPS Engine Software: 17.2.1r, 17.3.1a, 17.3.2, 17.3.3, 17.3.4, 17.3.4a (+65)
How to fix
Upgrade to a fixed version: Cisco Snort 3.9.2.0. Check the vendor advisory for mitigations.
References
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