Buffer overflow in Cisco Cyber Vision
CVE-2026-20067
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 the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP 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.
Vulnerability class: Buffer Overflow
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
EPSS: 0.005 (39.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Cisco Cyber Vision — versions 3.0.0, 3.0.2, 3.0.3
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.0.0, 7.0.0.1, 7.0.1
- Cisco Utd Snort Ips Engine Software — versions 17.3.1a, 17.2.1r, 17.3.2
- Cisco Cyber Vision — versions 3.0.0, 3.0.1, 3.0.2
- Cisco Secure Firewall Threat Defense — versions 7.0.0, 7.0.0.1, 7.0.1
- Cisco Snort
- Cisco Unified Threat Defense Snort Intrusion Prevention System Engine — versions 17.10.1a, 17.11.1a, 17.12.1a
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20067?
- CVE-2026-20067 is a medium-severity vulnerability in Cisco Cyber Vision, classified under Out-of-bounds Write. CVSS score: 5.8/10. Published 2026-03-04.
- How severe is CVE-2026-20067?
- Medium severity. CVSS v3 base score is 5.8 out of 10.