Vulnerability details

CVE-2026-20043

Cisco Cyber VisionCisco Open Source Snort3Cisco Secure Firewall Threat Defense SoftwareCisco UTD SNORT IPS Engine Software

Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

CVSS 3.1
9.0Critical

Official description

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 scores

ScoreVersionSourceVector
9.0Critical 3.1 CVEProject cvelistV5 (CNA) (cisco) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

200 of 312
VendorProductVersionsSource
Cisco Cisco Cyber Vision 3.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.5 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.0.6 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.1.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.1.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.2.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.2.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.2.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 3.2.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.0.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.0.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.5 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.6 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.1.7 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.6 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.2.X CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.3.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.3.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.3.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.4.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.4.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.4.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 4.4.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.0.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.1.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.1.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.1.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.2.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.3.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.3.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.3.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.4.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.4.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.4.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.5.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.5.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.6.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.7.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.7.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.8.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Cyber Vision 5.8.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.10.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.12.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.13.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.14.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.15.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.16.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.17.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.18.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.19.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.20.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.21.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.22.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.23.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.24.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.25.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.27.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.28.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.29.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.30.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.31.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.32.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.36.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.38.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.39.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.4.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.40.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.41.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.42.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.43.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.45.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.47.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.48.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.5.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.50.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.51.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.52.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.53.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.55.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.56.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.57.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.58.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.59.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.6.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.60.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.61.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.62.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.63.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.64.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.65.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.66.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.67.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.69.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.7.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.70.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.71.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.72.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.73.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.74.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.75.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.76.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.77.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.78.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.8.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.81.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.82.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.83.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.84.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.1.9.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.10.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.10.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.10.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.11.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.12.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.12.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.2.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.2.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.4.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.5.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.3.7.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.5.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.5.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.5.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.6.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.6.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.6.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.6.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.7.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.7.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.7.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.7.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.7.4.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.8.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.1.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.2.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.3.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.5.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.6.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Open Source Snort3 3.9.7.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 10.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.5 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.7 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.0.9 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.11 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.3 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.1 CVEProject cvelistV5 (CNA)
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.2 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-10-21
Last updated
2026-11-07
State
Published
Assigner (CNA)
cisco
Kolun priority
32 · Low

Exploit prediction (EPSS)

0.37%
Probability of exploitation in 30 days
31.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-787
    Out-of-bounds Write