CVE-2026-20043: Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

Published Oct 21, 2026

Updated

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.

Affected Software

1 affected component

Cisco Snort 3

Event History

Oct 21, 2026

CVE Published

via MITRE·04:12 PM

Data Sourced

via MITRE·04:12 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What does an attacker need to exploit this issue?

The vulnerability is network-reachable and does not require privileges or user interaction. Exploitation has high attack complexity.

What could successful exploitation affect?

The reported impact includes high confidentiality, integrity, and availability impact, with a changed scope.

CVE-2026-20043: Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

Affected Software

Event History

Frequently Asked Questions

What does an attacker need to exploit this issue?

What could successful exploitation affect?

Company

Resources

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Frequently Asked Questions

What does an attacker need to exploit this issue?

What could successful exploitation affect?