CVE-2026-20236 - 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-2026-20236 are related to issues concerning incorrect calculation that are grouped under the Common Weakness Enumeration (CWE) Base CWE-682.

Published: 2026-10-21

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The CVE describes an issue involving improper calculation in Cisco’s Snort 3 software, classified under CWE‑682. This flaw could result in erroneous processing of inputs, which in turn may cause incorrect behavior or failure of the Snort engine. The impact is limited to the affected product’s operation and could manifest as malfunction, degraded performance, or unintended resource usage.

Affected Systems

Affected products are Cisco Cyber Vision, Cisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, and Cisco UTD SNORT IPS Engine Software. Version details have not been disclosed in the advisory.

Risk and Exploitability

The vulnerability carries a CVSS score of 7.5, indicating high severity. No EPSS data is provided, and the vulnerability is not listed in CISA KEV. The attack vector is not specified, but based on the description it is inferred that the flaw may be exploitable through malformed input to the Snort 3 engine. No public exploit has been reported, so the likelihood remains uncertain.

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	generic	—
`7.0.2.1`	affected	generic	—
`7.0.3`	affected	generic	—
`7.2.0.1`	affected	semver	—
`7.0.4`	affected	generic	—
`7.2.1`	affected	semver	—
`7.0.5`	affected	semver	—
`7.3.0`	affected	semver	—
`7.4.0`	affected	semver	—
`7.2.2`	affected	generic	—
`7.2.3`	affected	generic	—
`7.3.1`	affected	semver	—
`7.2.4`	affected	generic	—
`7.0.6`	affected	semver	—
`7.2.5`	affected	semver	—
`7.2.4.1`	affected	generic	—
`7.3.1.1`	affected	semver	—
`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	semver	—
`7.0.6.2`	affected	semver	—
`7.4.1.1`	affected	semver	—
`7.2.7`	affected	semver	—
`7.2.5.2`	affected	generic	—
`7.3.1.2`	affected	semver	—
`7.2.8`	affected	generic	—
`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	semver	—
`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	semver	—
`7.6.1`	affected	semver	—
`7.4.2.3`	affected	semver	—
`7.0.8`	affected	semver	—
`7.6.2`	affected	semver	—
`7.7.10`	affected	semver	—
`7.7.11`	affected	semver	—
`7.0.8.1`	affected	semver	—
`7.6.2.1`	affected	semver	—
`7.7.10.1`	affected	semver	—
`7.4.2.4`	affected	semver	—
`7.2.10.2`	affected	semver	—
`7.4.3`	affected	semver	—
`7.6.4`	affected	semver	—
`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	—
`17.12.3a`	affected	generic	—
`17.15.1a`	affected	generic	—
`17.16.1a`	affected	generic	—
`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	generic	—
`17.15.3a`	affected	generic	—
`17.15.3`	affected	generic	—
`17.12.5b`	affected	generic	—
`17.12.5c`	affected	generic	—
`17.15.4`	affected	semver	—
`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	semver	—
`26.1.1`	affected	generic	—
`17.15.5`	affected	semver	—
`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	semver	—
`17.18.4`	affected	semver	—
`26.1.2`	affected	semver	—

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	—
`3.12.2.0`	affected	generic	—

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	generic	—
`7.0.2.1`	affected	generic	—
`7.0.3`	affected	generic	—
`7.2.0.1`	affected	semver	—
`7.0.4`	affected	generic	—
`7.2.1`	affected	semver	—
`7.0.5`	affected	semver	—
`7.3.0`	affected	semver	—
`7.4.0`	affected	semver	—
`7.2.2`	affected	generic	—
`7.2.3`	affected	generic	—
`7.3.1`	affected	semver	—
`7.2.4`	affected	generic	—
`7.0.6`	affected	semver	—
`7.2.5`	affected	semver	—
`7.2.4.1`	affected	generic	—
`7.3.1.1`	affected	semver	—
`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	semver	—
`7.0.6.2`	affected	semver	—
`7.4.1.1`	affected	semver	—
`7.2.7`	affected	semver	—
`7.2.5.2`	affected	generic	—
`7.3.1.2`	affected	semver	—
`7.2.8`	affected	generic	—
`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	semver	—
`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	semver	—
`7.6.1`	affected	semver	—
`7.4.2.3`	affected	semver	—
`7.0.8`	affected	semver	—
`7.6.2`	affected	semver	—
`7.7.10`	affected	semver	—
`7.7.11`	affected	semver	—
`7.0.8.1`	affected	semver	—
`7.6.2.1`	affected	semver	—
`7.7.10.1`	affected	semver	—
`7.4.2.4`	affected	semver	—
`7.2.10.2`	affected	semver	—
`7.4.3`	affected	semver	—
`7.6.4`	affected	semver	—
`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.

OpenCVE Recommended Actions

Apply the hardening releases provided by Cisco to all affected Cisco Cyber Vision, Cisco Open Source Snort3, Cisco Secure Firewall Threat Defense, and Cisco UTD SNORT IPS Engine Software instances.
If patches cannot be applied immediately, isolate the Snort 3 engine to trusted network segments and monitor for abnormal packet handling or failures that could indicate abuse of the calculation flaw.
Configure alerting for any parsing errors or unexpected resource consumption that may be caused by the incorrect calculation.

Generated by OpenCVE AI on October 22, 2026 at 04:19 UTC.

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 0.00448.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

History

Sat, 07 Nov 2026 18:30:00 +0000

Type	Values Removed	Values Added
References		https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Thu, 22 Oct 2026 16:45:00 +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-2026-20236 are related to issues concerning incorrect calculation that are grouped under the Common Weakness Enumeration (CWE) Base CWE-682.
Title		Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
Weaknesses		CWE-682
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: 2026-10-21T16:12:58.186Z

Updated: 2026-11-07T17:29:44.378Z

Reserved: 2025-10-08T11:59:15.400Z

Link: CVE-2026-20236

Vulnrichment

Updated: 2026-11-07T17:29:44.378Z

NVD

Status : Awaiting Analysis

Published: 2026-10-21T17:18:28.247

Modified: 2026-11-07T18:17:22.247

Link: CVE-2026-20236

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-10-22T16:30:08Z

Weaknesses

CWE-682
Incorrect Calculation

Impact

Affected Systems

Risk and Exploitability

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

JSON object

JSON object

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