7.5
High
CVE-2026-20356 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3…
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-2026-20356 are related to issues concerning uncontrolled resource consumption that are grouped under the Common Weakness Enumeration (CWE) Base CWE-400.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Cyber Vision 5.8 | 5.8.0 → 5.8.1 | No fix stated |
| Cisco Cyber Vision 5.7 | 5.7.0 → 5.7.1 | No fix stated |
| Cisco Cyber Vision | 5.6.1 | No fix stated |
| Cisco Cyber Vision 5.5 | 5.5.1 → 5.5.2 | No fix stated |
| Cisco Cyber Vision 5.4 | 5.4.0 → 5.4.2 | No fix stated |
| Cisco Cyber Vision 5.3 | 5.3.0 → 5.3.3 | No fix stated |
| Cisco Cyber Vision 5.2 | 5.2.0 → 5.2.1 | No fix stated |
| Cisco Cyber Vision 5.1 | 5.1.0 → 5.1.3 | No fix stated |
| Cisco Cyber Vision 5.0 | 5.0.0 → 5.0.2 | No fix stated |
Show the 34 other branches Hide the 34 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Cyber Vision 4.4 | 4.4.0 → 4.4.3 | No fix stated |
| Cisco Cyber Vision 4.3 | 4.3.0 → 4.3.3 | No fix stated |
| Cisco Cyber Vision 4.2 | 4.2.X → 4.2.6 | No fix stated |
| Cisco Cyber Vision 4.1 | 4.1.0 → 4.1.7 | No fix stated |
| Cisco Cyber Vision 4.0 | 4.0.0 → 4.0.3 | No fix stated |
| Cisco Cyber Vision 3.2 | 3.2.0 → 3.2.4 | No fix stated |
| Cisco Cyber Vision 3.1 | 3.1.0 → 3.1.2 | No fix stated |
| Cisco Cyber Vision 3.0 | 3.0.0 → 3.0.6 | No fix stated |
| Cisco Open Source Snort3 3.12 | 3.12.1.0 → 3.12.2.0 | No fix stated |
| Cisco Open Source Snort3 | 3.11.1.0 | No fix stated |
| Cisco Open Source Snort3 3.10 | 3.10.0.0 → 3.10.2.0 | No fix stated |
| Cisco Open Source Snort3 3.9 | 3.9.0.0 → 3.9.7.0 | No fix stated |
| Cisco Open Source Snort3 | 3.8.1.0 | No fix stated |
| Cisco Open Source Snort3 3.7 | 3.7.0.0 → 3.7.4.0 | No fix stated |
| Cisco Open Source Snort3 3.6 | 3.6.0.0 → 3.6.3.0 | No fix stated |
| Cisco Open Source Snort3 3.5 | 3.5.0.0 → 3.5.2.0 | No fix stated |
| Cisco Open Source Snort3 3.3 | 3.3.0.0 → 3.3.7.0 | No fix stated |
| Cisco Open Source Snort3 3.2 | 3.2.1.0 → 3.2.2.0 | No fix stated |
| Cisco Open Source Snort3 3.1 | 3.1.2.0 → 3.1.84.0 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software | 10.0.0 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.7 | 7.7.0 → 7.7.11 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.6 | 7.6.0 → 7.6.4 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.4 | 7.4.0 → 7.4.7 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.3 | 7.3.0 → 7.3.1.2 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.2 | 7.2.0 → 7.2.11 | No fix stated |
| Cisco Secure Firewall Threat Defense (FTD) Software 7.0 | 7.0.0 → 7.0.9 | No fix stated |
| Cisco UTD SNORT IPS Engine Software 26.1 | 26.1.1 → 26.1.2 | No fix stated |
| Cisco UTD SNORT IPS Engine Software 17.18 | 17.18.1a → 17.18.4 | No fix stated |
| Cisco UTD SNORT IPS Engine Software | 17.17.1 | No fix stated |
| Cisco UTD SNORT IPS Engine Software | 17.16.1a | No fix stated |
| Cisco UTD SNORT IPS Engine Software 17.15 | 17.15.1a → 17.15.6 | No fix stated |
| Cisco UTD SNORT IPS Engine Software | 17.14.1a | No fix stated |
| Cisco UTD SNORT IPS Engine Software | 17.13.1a | No fix stated |
| Cisco UTD SNORT IPS Engine Software 17.12 | 17.12.1a → 17.12.8 | No fix stated |
References
- cisco-sa-hardening-snort3-ybgmhTQe sec.cloudapps.cisco.com
Timeline
- Published
- Last modified
Other CVEs of Cisco Cyber Vision
The 20 CVEs of Cisco Cyber Vision →
CVE-2026-20236
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3…
7.5
High
CVE-2026-20221
Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel…
5.8
Medium
CVE-2026-20291
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3…
7.8
High
CVE-2026-20043
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3…
9.0
Critical