CVE-2026-20043
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
CVSS Score
9.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | cisco |
| Product | cisco cyber vision |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cisco / Cisco Cyber Vision
3.0.0 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 4.1.1 4.1.2 4.1.3 4.1.4 4.2.0 4.2.1 4.1.5 4.2.2 4.2.X 4.2.3 4.2.4 4.2.6 4.1.6 4.3.0 4.3.1 4.3.2 4.3.3 4.4.0 4.4.1 4.4.2 4.4.3 4.1.7 5.0.0 5.0.1 5.0.2 5.1.0 5.1.1 5.1.2 5.1.3 5.2.0 5.2.1 5.3.0 5.3.1 5.3.2 5.3.3 5.5.1 5.6.1 5.4.0 5.4.1 5.4.2 5.7.0 5.8.1 5.7.1 5.8.0 5.5.2
Cisco / Cisco Open Source Snort3
3.12.2.0 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 3.1.22.0 3.1.23.0 3.1.24.0 3.1.25.0 3.1.27.0 3.1.28.0 3.1.29.0 3.1.30.0 3.1.31.0 3.1.32.0 3.1.36.0 3.1.38.0 3.1.39.0 3.1.40.0 3.1.41.0 3.1.42.0 3.1.43.0 3.1.45.0 3.1.47.0 3.1.48.0 3.1.50.0 3.1.51.0 3.1.52.0 3.1.53.0 3.1.55.0 3.1.56.0 3.1.57.0 3.1.58.0 3.1.59.0 3.1.60.0 3.1.61.0 3.1.62.0 3.1.63.0 3.1.64.0 3.1.65.0 3.1.66.0 3.1.67.0 3.1.69.0 3.1.70.0 3.1.71.0 3.1.72.0 3.1.73.0 3.1.74.0 3.1.75.0 3.1.76.0 3.1.77.0 3.1.78.0 3.1.81.0 3.1.82.0 3.1.83.0 3.1.84.0 3.2.1.0 3.2.2.0 3.3.0.0 3.3.1.0 3.3.2.0 3.3.3.0 3.3.4.0 3.3.5.0 3.3.7.0 3.5.0.0 3.5.1.0 3.8.1.0 3.6.0.0 3.6.2.0 3.9.3.0 3.7.2.0 3.7.0.0 3.9.6.0 3.10.0.0 3.10.2.0 3.7.4.0 3.9.0.0 3.5.2.0 3.12.1.0 3.6.1.0 3.9.2.0 3.6.3.0 3.9.5.0 3.7.1.0 3.9.7.0 3.7.3.0 3.10.1.0 3.9.1.0 3.11.1.0
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
7.0.0 7.0.0.1 7.0.1 7.0.1.1 7.0.2 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 7.3.1.1 7.4.0 7.0.6.1 7.2.5.1 7.4.1 7.2.6 7.0.6.2 7.4.1.1 7.2.7 7.2.5.2 7.3.1.2 7.2.8 7.6.0 7.4.2 7.2.8.1 7.0.6.3 7.4.2.1 7.2.9 7.0.7 7.7.0 7.4.2.2 7.2.10 7.6.1 7.4.2.3 7.0.8 7.6.2 7.7.10 7.7.11 7.0.8.1 7.6.2.1 7.7.10.1 7.4.2.4 7.2.10.2 7.4.3 7.6.4 10.0.0 7.4.4 7.0.9 7.2.11 7.4.7
Cisco / Cisco UTD SNORT IPS Engine Software
17.3.1a 17.3.2 17.4.1a 17.5.1 17.3.3 17.5.1a 17.3.4 17.3.4a 17.4.2 17.4.1b 17.6.1a 17.7.1a 17.6.2 17.8.1a 17.3.5 17.6.3 17.6.3a 17.7.2 17.9.1a 17.6.4 17.10.1a 17.3.6 17.3.7 17.9.2a 17.6.5 17.11.1a 17.9.3a 17.12.1a 17.9.4 17.6.6 17.3.8 17.3.8a 17.6.6a 17.9.4a 17.12.2 17.13.1a 17.9.5a 17.12.3 17.6.7 17.14.1a 17.12.4 17.12.3a 17.15.1a 17.6.8 17.9.6 17.6.8a 17.16.1a 17.9.5e 17.12.4a 17.15.2c 17.9.5f 17.12.4b 17.15.2a 17.12.5 17.17.1 17.12.5a 17.9.7a 17.15.3a 17.15.3 17.12.5b 17.12.5c 17.15.4 17.9.7b 17.18.1 17.18.1a 17.12.6 17.9.8 17.15.4c 17.12.5d 17.18.2 26.1.1 17.15.5 17.15.5a 17.12.7 17.12.7a 17.12.7b 17.9.9 17.18.3a 17.12.8 17.15.6 17.18.4 26.1.2 17.9.10