CVE-2026-20356 - Vulnerability Details

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

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.

Published: 2026-10-21

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Cyber Vision

unknown

Version	Status	Constraints
`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	—

Cisco

Cisco Open Source Snort3

unknown

Version	Status	Constraints
`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`	affected	—

Cisco

Cisco Secure Firewall Threat Defense (FTD) Software

unknown

Version	Status	Constraints
`7.0.0`	affected	—
`7.0.0.1`	affected	—
`7.0.1`	affected	—
`7.0.1.1`	affected	—
`7.0.2`	affected	—
`7.2.0`	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	—

Cisco

Cisco UTD SNORT IPS Engine Software

unknown

Version	Status	Constraints
`17.12.1a`	affected	—
`17.12.2`	affected	—
`17.13.1a`	affected	—
`17.12.3`	affected	—
`17.14.1a`	affected	—
`17.12.4`	affected	—
`17.12.3a`	affected	—
`17.15.1a`	affected	—
`17.16.1a`	affected	—
`17.12.4a`	affected	—
`17.15.2c`	affected	—
`17.12.4b`	affected	—
`17.15.2a`	affected	—
`17.12.5`	affected	—
`17.17.1`	affected	—
`17.12.5a`	affected	—
`17.15.3a`	affected	—
`17.15.3`	affected	—
`17.12.5b`	affected	—
`17.12.5c`	affected	—
`17.15.4`	affected	—
`17.18.1`	affected	—
`17.18.1a`	affected	—
`17.12.6`	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	—
`17.18.3a`	affected	—
`17.12.8`	affected	—
`17.15.6`	affected	—
`17.18.4`	affected	—
`26.1.2`	affected	—

No data.

Vendor Product Confidence Versions

Cisco

Cisco Open Source Snort3

100%

Version	Status	Scheme	Platform
`3.12.2.0`	affected	generic	—
`3.1.2.0`	affected	generic	—
`3.1.3.0`	affected	generic	—
`3.1.4.0`	affected	generic	—
`3.1.5.0`	affected	generic	—
`3.1.6.0`	affected	generic	—
`3.1.7.0`	affected	generic	—
`3.1.8.0`	affected	generic	—
`3.1.9.0`	affected	generic	—
`3.1.10.0`	affected	generic	—
`3.1.12.0`	affected	generic	—
`3.1.13.0`	affected	generic	—
`3.1.14.0`	affected	generic	—
`3.1.15.0`	affected	generic	—
`3.1.16.0`	affected	generic	—
`3.1.17.0`	affected	generic	—
`3.1.18.0`	affected	generic	—
`3.1.19.0`	affected	generic	—
`3.1.20.0`	affected	generic	—
`3.1.21.0`	affected	generic	—
`3.1.22.0`	affected	generic	—
`3.1.23.0`	affected	generic	—
`3.1.24.0`	affected	generic	—
`3.1.25.0`	affected	generic	—
`3.1.27.0`	affected	generic	—
`3.1.28.0`	affected	generic	—
`3.1.29.0`	affected	generic	—
`3.1.30.0`	affected	generic	—
`3.1.31.0`	affected	generic	—
`3.1.32.0`	affected	generic	—
`3.1.36.0`	affected	generic	—
`3.1.38.0`	affected	generic	—
`3.1.39.0`	affected	generic	—
`3.1.40.0`	affected	generic	—
`3.1.41.0`	affected	generic	—
`3.1.42.0`	affected	generic	—
`3.1.43.0`	affected	generic	—
`3.1.45.0`	affected	generic	—
`3.1.47.0`	affected	generic	—
`3.1.48.0`	affected	generic	—
`3.1.50.0`	affected	generic	—
`3.1.51.0`	affected	generic	—
`3.1.52.0`	affected	generic	—
`3.1.53.0`	affected	generic	—
`3.1.55.0`	affected	generic	—
`3.1.56.0`	affected	generic	—
`3.1.57.0`	affected	generic	—
`3.1.58.0`	affected	generic	—
`3.1.59.0`	affected	generic	—
`3.1.60.0`	affected	generic	—
`3.1.61.0`	affected	generic	—
`3.1.62.0`	affected	generic	—
`3.1.63.0`	affected	generic	—
`3.1.64.0`	affected	generic	—
`3.1.65.0`	affected	generic	—
`3.1.66.0`	affected	generic	—
`3.1.67.0`	affected	generic	—
`3.1.69.0`	affected	generic	—
`3.1.70.0`	affected	generic	—
`3.1.71.0`	affected	generic	—
`3.1.72.0`	affected	generic	—
`3.1.73.0`	affected	generic	—
`3.1.74.0`	affected	generic	—
`3.1.75.0`	affected	generic	—
`3.1.76.0`	affected	generic	—
`3.1.77.0`	affected	generic	—
`3.1.78.0`	affected	generic	—
`3.1.81.0`	affected	generic	—
`3.1.82.0`	affected	generic	—
`3.1.83.0`	affected	generic	—
`3.1.84.0`	affected	generic	—
`3.2.1.0`	affected	generic	—
`3.2.2.0`	affected	generic	—
`3.3.0.0`	affected	generic	—
`3.3.1.0`	affected	generic	—
`3.3.2.0`	affected	generic	—
`3.3.3.0`	affected	generic	—
`3.3.4.0`	affected	generic	—
`3.3.5.0`	affected	generic	—
`3.3.7.0`	affected	generic	—
`3.5.0.0`	affected	generic	—
`3.5.1.0`	affected	generic	—
`3.8.1.0`	affected	generic	—
`3.6.0.0`	affected	generic	—
`3.6.2.0`	affected	generic	—
`3.9.3.0`	affected	generic	—
`3.7.2.0`	affected	generic	—
`3.7.0.0`	affected	generic	—
`3.9.6.0`	affected	generic	—
`3.10.0.0`	affected	generic	—
`3.10.2.0`	affected	generic	—
`3.7.4.0`	affected	generic	—
`3.9.0.0`	affected	generic	—
`3.5.2.0`	affected	generic	—
`3.12.1.0`	affected	generic	—
`3.6.1.0`	affected	generic	—
`3.9.2.0`	affected	generic	—
`3.6.3.0`	affected	generic	—
`3.9.5.0`	affected	generic	—
`3.7.1.0`	affected	generic	—
`3.9.7.0`	affected	generic	—
`3.7.3.0`	affected	generic	—
`3.10.1.0`	affected	generic	—
`3.9.1.0`	affected	generic	—
`3.11.1.0`	affected	generic	—

Cisco

Cisco Secure Firewall Threat Defense (ftd) Software

100%

Version	Status	Scheme	Platform
`7.0.0`	affected	semver	—
`7.0.0.1`	affected	generic	—
`7.0.1`	affected	semver	—
`7.0.1.1`	affected	generic	—
`7.0.2`	affected	semver	—
`7.2.0`	affected	semver	—
`7.0.2.1`	affected	semver	—
`7.0.3`	affected	generic	—
`7.2.0.1`	affected	semver	—
`7.0.4`	affected	semver	—
`7.2.1`	affected	semver	—
`7.0.5`	affected	semver	—
`7.3.0`	affected	semver	—
`7.2.2`	affected	semver	—
`7.2.3`	affected	semver	—
`7.3.1`	affected	semver	—
`7.2.4`	affected	semver	—
`7.0.6`	affected	semver	—
`7.2.5`	affected	semver	—
`7.2.4.1`	affected	generic	—
`7.3.1.1`	affected	generic	—
`7.4.0`	affected	semver	—
`7.0.6.1`	affected	semver	—
`7.2.5.1`	affected	semver	—
`7.4.1`	affected	semver	—
`7.2.6`	affected	generic	—
`7.0.6.2`	affected	semver	—
`7.4.1.1`	affected	generic	—
`7.2.7`	affected	generic	—
`7.2.5.2`	affected	generic	—
`7.3.1.2`	affected	generic	—
`7.2.8`	affected	generic	—
`7.3.0`	affected	semver	—
`7.6.0`	affected	semver	—
`7.4.2`	affected	semver	—
`7.2.8.1`	affected	generic	—
`7.0.6.3`	affected	semver	—
`7.4.2.1`	affected	generic	—
`7.2.9`	affected	generic	—
`7.0.7`	affected	semver	—
`7.7.0`	affected	semver	—
`7.4.2.2`	affected	semver	—
`7.2.10`	affected	generic	—
`7.6.1`	affected	semver	—
`7.4.2.3`	affected	semver	—
`7.0.8`	affected	generic	—
`7.6.2`	affected	generic	—
`7.7.10`	affected	semver	—
`7.7.11`	affected	semver	—
`7.0.8.1`	affected	generic	—
`7.6.2.1`	affected	generic	—
`7.7.10.1`	affected	generic	—
`7.4.2.4`	affected	generic	—
`7.2.10.2`	affected	generic	—
`7.4.3`	affected	generic	—
`7.6.4`	affected	generic	—
`10.0.0`	affected	semver	—
`7.4.4`	affected	semver	—
`7.0.9`	affected	semver	—
`7.2.11`	affected	semver	—
`7.4.7`	affected	semver	—

Cisco

Cisco Utd Snort Ips Engine Software

100%

Version	Status	Scheme	Platform
`17.12.1a`	affected	generic	—
`17.12.2`	affected	semver	—
`17.13.1a`	affected	generic	—
`17.12.3`	affected	semver	—
`17.14.1a`	affected	generic	—
`17.12.4`	affected	semver	—
`17.12.3`	affected	semver	—
`17.15.1a`	affected	generic	—
`17.16.1a`	affected	semver	—
`17.12.4a`	affected	generic	—
`17.15.2c`	affected	generic	—
`17.12.4b`	affected	generic	—
`17.15.2a`	affected	generic	—
`17.12.5`	affected	semver	—
`17.17.1`	affected	semver	—
`17.12.5a`	affected	semver	—
`17.15.3a`	affected	generic	—
`17.15.3`	affected	semver	—
`17.12.5b`	affected	generic	—
`17.12.5c`	affected	generic	—
`17.15.4`	affected	generic	—
`17.18.1`	affected	semver	—
`17.18.1a`	affected	generic	—
`17.12.6`	affected	semver	—
`17.15.4c`	affected	generic	—
`17.12.5d`	affected	generic	—
`17.18.2`	affected	generic	—
`26.1.1`	affected	semver	—
`17.15.5`	affected	generic	—
`17.15.5a`	affected	generic	—
`17.12.7`	affected	semver	—
`17.12.7a`	affected	generic	—
`17.12.7b`	affected	generic	—
`17.18.3a`	affected	generic	—
`17.12.8`	affected	semver	—
`17.15.6`	affected	generic	—
`17.18.4`	affected	semver	—
`26.1.2`	affected	generic	—

Cisco

Cyber Vision

100%

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

Cisco

Secure Firewall Threat Defense

100%

Version	Status	Scheme	Platform
`7.0.0`	affected	semver	—
`7.0.0.1`	affected	generic	—
`7.0.1`	affected	semver	—
`7.0.1.1`	affected	generic	—
`7.0.2`	affected	semver	—
`7.2.0`	affected	semver	—
`7.0.2.1`	affected	semver	—
`7.0.3`	affected	generic	—
`7.2.0.1`	affected	semver	—
`7.0.4`	affected	semver	—
`7.2.1`	affected	semver	—
`7.0.5`	affected	semver	—
`7.3.0`	affected	semver	—
`7.2.2`	affected	semver	—
`7.2.3`	affected	semver	—
`7.3.1`	affected	semver	—
`7.2.4`	affected	semver	—
`7.0.6`	affected	semver	—
`7.2.5`	affected	semver	—
`7.2.4.1`	affected	generic	—
`7.3.1.1`	affected	generic	—
`7.4.0`	affected	semver	—
`7.0.6.1`	affected	semver	—
`7.2.5.1`	affected	semver	—
`7.4.1`	affected	semver	—
`7.2.6`	affected	generic	—
`7.0.6.2`	affected	semver	—
`7.4.1.1`	affected	generic	—
`7.2.7`	affected	generic	—
`7.2.5.2`	affected	generic	—
`7.3.1.2`	affected	generic	—
`7.2.8`	affected	generic	—
`7.3.0`	affected	semver	—
`7.6.0`	affected	semver	—
`7.4.2`	affected	semver	—
`7.2.8.1`	affected	generic	—
`7.0.6.3`	affected	semver	—
`7.4.2.1`	affected	generic	—
`7.2.9`	affected	generic	—
`7.0.7`	affected	semver	—
`7.7.0`	affected	semver	—
`7.4.2.2`	affected	semver	—
`7.2.10`	affected	generic	—
`7.6.1`	affected	semver	—
`7.4.2.3`	affected	semver	—
`7.0.8`	affected	generic	—
`7.6.2`	affected	generic	—
`7.7.10`	affected	semver	—
`7.7.11`	affected	semver	—
`7.0.8.1`	affected	generic	—
`7.6.2.1`	affected	generic	—
`7.7.10.1`	affected	generic	—
`7.4.2.4`	affected	generic	—
`7.2.10.2`	affected	generic	—
`7.4.3`	affected	generic	—
`7.6.4`	affected	generic	—
`10.0.0`	affected	semver	—
`7.4.4`	affected	semver	—
`7.0.9`	affected	semver	—
`7.2.11`	affected	semver	—
`7.4.7`	affected	semver	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00346.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe

History

Fri, 23 Oct 2026 07:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco cisco Open Source Snort3 Cisco cisco Secure Firewall Threat Defense (ftd) Software Cisco cisco Utd Snort Ips Engine Software Cisco cyber Vision Cisco secure Firewall Threat Defense
Vendors & Products		Cisco Cisco cisco Open Source Snort3 Cisco cisco Secure Firewall Threat Defense (ftd) Software Cisco cisco Utd Snort Ips Engine Software Cisco cyber Vision Cisco secure Firewall Threat Defense

Thu, 22 Oct 2026 14:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 21 Oct 2026 17:15:00 +0000

Type	Values Removed	Values Added
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.
Title		Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
Weaknesses		CWE-400
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Subscriptions

Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (ftd) Software Cisco Utd Snort Ips Engine Software Cyber Vision Secure Firewall Threat Defense

MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-10-21T16:13:06.738Z

Updated: 2026-10-22T19:10:52.805Z

Reserved: 2025-10-08T11:59:15.414Z

Link: CVE-2026-20356

Vulnrichment

Updated: 2026-10-22T13:36:39.530Z

NVD

Status : Awaiting Analysis

Published: 2026-10-21T17:18:28.703

Modified: 2026-10-22T14:17:41.723

Link: CVE-2026-20356

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-10-23T07:30:08Z

Weaknesses

CWE-400
Uncontrolled Resource Consumption

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

JSON object

JSON object

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JSON object

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