Cisco ships Snort 3 hardening for CVE-2026-20043 out-of-bounds writes
Original title: Multiple Cisco Products Snort 3 Security Hardening Release: October 2026
An internal Snort 3 review grouped multiple out-of-bounds write issues, CWE-787, under CVE-2026-20043.
Cisco's Open Source Snort 3 engineering team says an internal security review produced software hardening releases for multiple internally discovered vulnerabilities in Snort 3 used by multiple Cisco products. Issues tracked as CVE-2026-20043 are out-of-bounds writes grouped under CWE-787. The October 2026 notice frames the work as proactive hardening. The snippet does not describe exploitation or list fixed versions.
Unconfirmed: The snippet does not state affected versions, fixed builds, or exploitation.
- Cisco says the issues were found in an internal review.
- CVE-2026-20043 covers out-of-bounds writes mapped to CWE-787.
- The notice is dated as an October 2026 hardening release.
- The snippet says multiple vulnerabilities were addressed.
Impact: Out-of-bounds writes in Snort 3
| Product | Affected |
|---|---|
| Cisco Snort 3 in multiple Cisco products | — |
- 1.Apply the Snort 3 security hardening releases Cisco published.
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-20043 | Out-of-bounds write in Cisco open-source Snort 3 | 9.0 | — |
From the original article
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.
sec.cloudapps.cisco.com
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