CVE-2026-20043
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
At a glance
- Severity
- CRITICAL 9.0
- EPSS
- EPSS 0.36 % · percentile 30 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Awaiting Analysis
Description
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | cisco |
| CVSS 3.1 | CRITICAL 9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · psirt@cisco.com (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-107372
- GCVE · GCVE-0-2026-20043
CERT-FR advisories
- CERTFR-2026-AVI-1360 — Multiples vulnérabilités dans les produits Cisco · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco Cyber Vision | affected 3.0.0 ; affected 3.0.2 ; affected 3.0.3 ; affected 3.0.1 ; affected 3.1.0 ; affected 3.0.4 |
| Cisco · Cisco Open Source Snort3 | affected 3.12.2.0 ; affected 3.1.2.0 ; affected 3.1.3.0 ; affected 3.1.4.0 ; affected 3.1.5.0 ; affected 3.1.6.0 |
| Cisco · Cisco Secure Firewall Threat Defense (FTD) Software | affected 7.0.0 ; affected 7.0.0.1 ; affected 7.0.1 ; affected 7.0.1.1 ; affected 7.0.2 ; affected 7.0.2.1 |
| Cisco · Cisco UTD SNORT IPS Engine Software | affected 17.3.1a ; affected 17.3.2 ; affected 17.4.1a ; affected 17.5.1 ; affected 17.3.3 ; affected 17.5.1a |
References
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |