Buffer overflow in Cisco Cyber Vision
CVE-2026-20043
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
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 Cyber Vision — versions 3.0.0, 3.0.1, 3.0.2
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 10.0.0, 7.0.0, 7.0.0.1
- Cisco Utd Snort Ips Engine Software — versions 17.10.1a, 17.11.1a, 17.12.1a
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20043?
- CVE-2026-20043 is a critical-severity vulnerability in Cisco Cyber Vision, classified under Out-of-bounds Write. CVSS score: 9.0/10. Published 2026-10-21.
- How severe is CVE-2026-20043?
- Critical severity. CVSS v3 base score is 9.0 out of 10.