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CVE-2026-20043

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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.

CVSS 9.0 · Critical · EPSS 0.3%

Published
Updated

Affected products and versions

  • cisco cyber vision

    Versions
    • 3.0.0: Affected
    • 3.0.2: Affected
    • 3.0.3: Affected
    • 3.0.1: Affected
    • 3.1.0: Affected
    • 3.0.4: Affected
    • 3.1.1: Affected
    • 3.1.2: Affected
    • 3.2.0: Affected
    • 3.0.5: Affected
    • 3.2.1: Affected
    • 3.0.6: Affected
    • 3.2.2: Affected
    • 3.2.3: Affected
    • 3.2.4: Affected
    • 4.0.0: Affected
    • 4.0.1: Affected
    • 4.0.2: Affected
    • 4.0.3: Affected
    • 4.1.0: Affected
    • 4.1.1: Affected
    • 4.1.2: Affected
    • 4.1.3: Affected
    • 4.1.4: Affected
    • 4.2.0: Affected
    • 4.2.1: Affected
    • 4.1.5: Affected
    • 4.2.2: Affected
    • 4.2.X: Affected
    • 4.2.3: Affected
    • 4.2.4: Affected
    • 4.2.6: Affected
    • 4.1.6: Affected
    • 4.3.0: Affected
    • 4.3.1: Affected
    • 4.3.2: Affected
    • 4.3.3: Affected
    • 4.4.0: Affected
    • 4.4.1: Affected
    • 4.4.2: Affected
    • 4.4.3: Affected
    • 4.1.7: Affected
    • 5.0.0: Affected
    • 5.0.1: Affected
    • 5.0.2: Affected
    • 5.1.0: Affected
    • 5.1.1: Affected
    • 5.1.2: Affected
    • 5.1.3: Affected
    • 5.2.0: Affected
    • 5.2.1: Affected
    • 5.3.0: Affected
    • 5.3.1: Affected
    • 5.3.2: Affected
    • 5.3.3: Affected
    • 5.5.1: Affected
    • 5.6.1: Affected
    • 5.4.0: Affected
    • 5.4.1: Affected
    • 5.4.2: Affected
    • 5.7.0: Affected
    • 5.8.1: Affected
    • 5.7.1: Affected
    • 5.8.0: Affected
    • 5.5.2: Affected

    No fix published

  • cisco open source snort3

    Versions
    • 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: Affected
    • 3.1.7.0: Affected
    • 3.1.8.0: Affected
    • 3.1.9.0: Affected
    • 3.1.10.0: Affected
    • 3.1.12.0: Affected
    • 3.1.13.0: Affected
    • 3.1.14.0: Affected
    • 3.1.15.0: Affected
    • 3.1.16.0: Affected
    • 3.1.17.0: Affected
    • 3.1.18.0: Affected
    • 3.1.19.0: Affected
    • 3.1.20.0: Affected
    • 3.1.21.0: Affected
    • 3.1.22.0: Affected
    • 3.1.23.0: Affected
    • 3.1.24.0: Affected
    • 3.1.25.0: Affected
    • 3.1.27.0: Affected
    • 3.1.28.0: Affected
    • 3.1.29.0: Affected
    • 3.1.30.0: Affected
    • 3.1.31.0: Affected
    • 3.1.32.0: Affected
    • 3.1.36.0: Affected
    • 3.1.38.0: Affected
    • 3.1.39.0: Affected
    • 3.1.40.0: Affected
    • 3.1.41.0: Affected
    • 3.1.42.0: Affected
    • 3.1.43.0: Affected
    • 3.1.45.0: Affected
    • 3.1.47.0: Affected
    • 3.1.48.0: Affected
    • 3.1.50.0: Affected
    • 3.1.51.0: Affected
    • 3.1.52.0: Affected
    • 3.1.53.0: Affected
    • 3.1.55.0: Affected
    • 3.1.56.0: Affected
    • 3.1.57.0: Affected
    • 3.1.58.0: Affected
    • 3.1.59.0: Affected
    • 3.1.60.0: Affected
    • 3.1.61.0: Affected
    • 3.1.62.0: Affected
    • 3.1.63.0: Affected
    • 3.1.64.0: Affected
    • 3.1.65.0: Affected
    • 3.1.66.0: Affected
    • 3.1.67.0: Affected
    • 3.1.69.0: Affected
    • 3.1.70.0: Affected
    • 3.1.71.0: Affected
    • 3.1.72.0: Affected
    • 3.1.73.0: Affected
    • 3.1.74.0: Affected
    • 3.1.75.0: Affected
    • 3.1.76.0: Affected
    • 3.1.77.0: Affected
    • 3.1.78.0: Affected
    • 3.1.81.0: Affected
    • 3.1.82.0: Affected
    • 3.1.83.0: Affected
    • 3.1.84.0: Affected
    • 3.2.1.0: Affected
    • 3.2.2.0: Affected
    • 3.3.0.0: Affected
    • 3.3.1.0: Affected
    • 3.3.2.0: Affected
    • 3.3.3.0: Affected
    • 3.3.4.0: Affected
    • 3.3.5.0: Affected
    • 3.3.7.0: Affected
    • 3.5.0.0: Affected
    • 3.5.1.0: Affected
    • 3.8.1.0: Affected
    • 3.6.0.0: Affected
    • 3.6.2.0: Affected
    • 3.9.3.0: Affected
    • 3.7.2.0: Affected
    • 3.7.0.0: Affected
    • 3.9.6.0: Affected
    • 3.10.0.0: Affected
    • 3.10.2.0: Affected
    • 3.7.4.0: Affected
    • 3.9.0.0: Affected
    • 3.5.2.0: Affected
    • 3.12.1.0: Affected
    • 3.6.1.0: Affected
    • 3.9.2.0: Affected
    • 3.6.3.0: Affected

    No fix published

  • cisco secure firewall threat defense (ftd) software

    Versions
    • 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: Affected
    • 7.0.3: Affected
    • 7.2.0.1: Affected
    • 7.0.4: Affected
    • 7.2.1: Affected
    • 7.0.5: Affected
    • 7.3.0: Affected
    • 7.2.2: Affected
    • 7.2.3: Affected
    • 7.3.1: Affected
    • 7.2.4: Affected
    • 7.0.6: Affected
    • 7.2.5: Affected
    • 7.2.4.1: Affected
    • 7.3.1.1: Affected
    • 7.4.0: Affected
    • 7.0.6.1: Affected
    • 7.2.5.1: Affected
    • 7.4.1: Affected
    • 7.2.6: Affected
    • 7.0.6.2: Affected
    • 7.4.1.1: Affected
    • 7.2.7: Affected
    • 7.2.5.2: Affected
    • 7.3.1.2: Affected
    • 7.2.8: Affected
    • 7.6.0: Affected
    • 7.4.2: Affected
    • 7.2.8.1: Affected
    • 7.0.6.3: Affected
    • 7.4.2.1: Affected
    • 7.2.9: Affected
    • 7.0.7: Affected
    • 7.7.0: Affected
    • 7.4.2.2: Affected
    • 7.2.10: Affected
    • 7.6.1: Affected
    • 7.4.2.3: Affected
    • 7.0.8: Affected
    • 7.6.2: Affected
    • 7.7.10: Affected
    • 7.7.11: Affected
    • 7.0.8.1: Affected
    • 7.6.2.1: Affected
    • 7.7.10.1: Affected
    • 7.4.2.4: Affected
    • 7.2.10.2: Affected
    • 7.4.3: Affected
    • 7.6.4: Affected
    • 10.0.0: Affected
    • 7.4.4: Affected
    • 7.0.9: Affected
    • 7.2.11: Affected
    • 7.4.7: Affected

    No fix published

  • cisco utd snort ips engine software

    Versions
    • 17.3.1a: Affected
    • 17.3.2: Affected
    • 17.4.1a: Affected
    • 17.5.1: Affected
    • 17.3.3: Affected
    • 17.5.1a: Affected
    • 17.3.4: Affected
    • 17.3.4a: Affected
    • 17.4.2: Affected
    • 17.4.1b: Affected
    • 17.6.1a: Affected
    • 17.7.1a: Affected
    • 17.6.2: Affected
    • 17.8.1a: Affected
    • 17.3.5: Affected
    • 17.6.3: Affected
    • 17.6.3a: Affected
    • 17.7.2: Affected
    • 17.9.1a: Affected
    • 17.6.4: Affected
    • 17.10.1a: Affected
    • 17.3.6: Affected
    • 17.3.7: Affected
    • 17.9.2a: Affected
    • 17.6.5: Affected
    • 17.11.1a: Affected
    • 17.9.3a: Affected
    • 17.12.1a: Affected
    • 17.9.4: Affected
    • 17.6.6: Affected
    • 17.3.8: Affected
    • 17.3.8a: Affected
    • 17.6.6a: Affected
    • 17.9.4a: Affected
    • 17.12.2: Affected
    • 17.13.1a: Affected
    • 17.9.5a: Affected
    • 17.12.3: Affected
    • 17.6.7: Affected
    • 17.14.1a: Affected
    • 17.12.4: Affected
    • 17.12.3a: Affected
    • 17.15.1a: Affected
    • 17.6.8: Affected
    • 17.9.6: Affected
    • 17.6.8a: Affected
    • 17.16.1a: Affected
    • 17.9.5e: Affected
    • 17.12.4a: Affected
    • 17.15.2c: Affected
    • 17.9.5f: Affected
    • 17.12.4b: Affected
    • 17.15.2a: Affected
    • 17.12.5: Affected
    • 17.17.1: Affected
    • 17.12.5a: Affected
    • 17.9.7a: Affected
    • 17.15.3a: Affected
    • 17.15.3: Affected
    • 17.12.5b: Affected
    • 17.12.5c: Affected
    • 17.15.4: Affected
    • 17.9.7b: Affected
    • 17.18.1: Affected
    • 17.18.1a: Affected
    • 17.12.6: Affected
    • 17.9.8: Affected
    • 17.15.4c: Affected
    • 17.12.5d: Affected
    • 17.18.2: Affected
    • 26.1.1: Affected
    • 17.15.5: Affected
    • 17.15.5a: Affected
    • 17.12.7: Affected
    • 17.12.7a: Affected
    • 17.12.7b: Affected
    • 17.9.9: Affected
    • 17.18.3a: Affected
    • 17.12.8: Affected
    • 17.15.6: Affected
    • 17.18.4: Affected
    • 26.1.2: Affected
    • 17.9.10: Affected

    No fix published

Original sources

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