Vulnerability in Cisco Open Source Snort3
CVE-2026-76489
Multiple Cisco products are affected by a vulnerability in the memory management implementation of Snort 3 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 Snort 3 processes files, which could cause unreleased memory. An attacker could exploit this vulnerability by sending a large number of files to be processed. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
Published · last modified .
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.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Open Source Snort3 — versions 3.1.10.0, 3.1.12.0, 3.1.13.0
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 10.0.0, 7.0.0, 7.0.0.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-76489?
- CVE-2026-76489 is a medium-severity vulnerability in Cisco Open Source Snort3, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.8/10. Published 2026-10-21.
- How severe is CVE-2026-76489?
- Medium severity. CVSS v3 base score is 5.8 out of 10.