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CVE-2026-20043

Multiple Cisco Products Snort 3 Software Hardening Release: October 2026 PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Cisco / Cisco Cyber Visionaffected 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
Cisco / Cisco Open Source Snort3affected 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 3.9.5.0; affected 3.7.1.0; affected 3.9.7.0; affected 3.7.3.0; affected 3.10.1.0; affected 3.9.1.0; affected 3.11.1.0
Cisco / Cisco Secure Firewall Threat Defense (FTD) Softwareaffected 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
Cisco / Cisco UTD SNORT IPS Engine Softwareaffected 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

CWE

CWE-787

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.