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VulnerabilitySeverity 7.5 high

Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

CVE-2026-20356 · CVE Program · October 21, 2026

Summary

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-2026-20356 are related to issues concerning uncontrolled resource consumption that are grouped under the Common Weakness Enumeration (CWE) Base CWE-400.

From CVE record (written by the reporting organization), quoted as published. Check the source before acting.

Affected products

VendorProductAffected versionsFixed
CiscoCisco Cyber Vision3.0.0, 3.0.2, 3.0.3, 3.0.1, 3.1.0, 3.0.4, 3.1.1, 3.1.2, 3.2.0, 3.0.5, 3.2.1, 3.0.6, 3.2.2, 3.2.3, 3.2.4, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.1.0—
CiscoCisco Open Source Snort33.12.2.0, 3.1.2.0, 3.1.3.0, 3.1.4.0, 3.1.5.0, 3.1.6.0, 3.1.7.0, 3.1.8.0, 3.1.9.0, 3.1.10.0, 3.1.12.0, 3.1.13.0, 3.1.14.0, 3.1.15.0, 3.1.16.0, 3.1.17.0, 3.1.18.0, 3.1.19.0, 3.1.20.0, 3.1.21.0—
CiscoCisco Secure Firewall Threat Defense (FTD) Software7.0.0, 7.0.0.1, 7.0.1, 7.0.1.1, 7.0.2, 7.2.0, 7.0.2.1, 7.0.3, 7.2.0.1, 7.0.4, 7.2.1, 7.0.5, 7.3.0, 7.2.2, 7.2.3, 7.3.1, 7.2.4, 7.0.6, 7.2.5, 7.2.4.1—
CiscoCisco UTD SNORT IPS Engine Software17.12.1a, 17.12.2, 17.13.1a, 17.12.3, 17.14.1a, 17.12.4, 17.12.3a, 17.15.1a, 17.16.1a, 17.12.4a, 17.15.2c, 17.12.4b, 17.15.2a, 17.12.5, 17.17.1, 17.12.5a, 17.15.3a, 17.15.3, 17.12.5b, 17.12.5c—

Why it's on these mode pages

  • Maritime: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Pipeline: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Freight rail: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Passenger rail and transit: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Highway and motor carrier: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Postal and parcel: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)

Change history

  1. November 9, 2026: First collected by Watch

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