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CVE-2026-20291

Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

HIGH
7.8
CVSS Score
Published: October 21, 2026 at 04:12 PM UTC
Updated: October 22, 2026 at 11:18 PM UTC
4 products affected across 1 vendorSecure Firewall Threat DefenseUnified Threat Defense Snort Intrusion Prevention System EngineCisco Cyber Vision

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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-2026-20291 are related to issues concerning improper privilege management that are grouped under the Common Weakness Enumeration (CWE) Base CWE-269.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cisco Open Source Snort3· Cisco
90%
3.1.10.03.1.12.03.1.13.03.1.14.03.1.15.03.1.16.03.1.17.03.1.18.03.1.19.03.1.2.03.1.20.03.1.21.03.1.22.03.1.23.03.1.24.03.1.25.03.1.27.03.1.28.03.1.29.03.1.3.03.1.30.03.1.31.03.1.32.03.1.36.03.1.38.03.1.39.03.1.4.03.1.40.03.1.41.03.1.42.03.1.43.03.1.45.03.1.47.03.1.48.03.1.5.03.1.50.03.1.51.03.1.52.03.1.53.03.1.55.03.1.56.03.1.57.03.1.58.03.1.59.03.1.6.03.1.60.03.1.61.03.1.62.03.1.63.03.1.64.03.1.65.03.1.66.03.1.67.03.1.69.03.1.7.03.1.70.03.1.71.03.1.72.03.1.73.03.1.74.03.1.75.03.1.76.03.1.77.03.1.78.03.1.8.03.1.81.03.1.82.03.1.83.03.1.84.03.1.9.03.10.0.03.10.1.03.10.2.03.11.1.03.12.1.03.12.2.03.2.1.03.2.2.03.3.0.03.3.1.03.3.2.03.3.3.03.3.4.03.3.5.03.3.7.03.5.0.03.5.1.03.5.2.03.6.0.03.6.1.03.6.2.03.6.3.03.7.0.03.7.1.03.7.2.03.7.3.03.7.4.03.8.1.03.9.0.03.9.1.03.9.2.03.9.3.03.9.5.03.9.6.03.9.7.0
Cisco Cyber Vision· Cisco
90%
3.0.03.0.13.0.23.0.33.0.43.0.53.0.63.1.03.1.13.1.23.2.03.2.13.2.23.2.33.2.44.0.04.0.14.0.24.0.34.1.04.1.14.1.24.1.34.1.44.1.54.1.64.1.74.2.04.2.14.2.24.2.34.2.44.2.64.2.X4.3.04.3.14.3.24.3.34.4.04.4.14.4.24.4.35.0.05.0.15.0.25.1.05.1.15.1.25.1.35.2.05.2.15.3.05.3.15.3.25.3.35.4.05.4.15.4.25.5.15.5.25.6.15.7.05.7.15.8.05.8.1
Secure Firewall Threat Defense· Cisco
90%
10.0.07.0.07.0.0.17.0.17.0.1.17.0.27.0.2.17.0.37.0.47.0.57.0.67.0.6.17.0.6.27.0.6.37.0.77.0.87.0.8.17.0.97.2.07.2.0.17.2.17.2.107.2.10.27.2.117.2.27.2.37.2.47.2.4.17.2.57.2.5.17.2.5.27.2.67.2.77.2.87.2.8.17.2.97.3.07.3.17.3.1.17.3.1.27.4.07.4.17.4.1.17.4.27.4.2.17.4.2.27.4.2.37.4.2.47.4.37.4.47.4.77.6.07.6.17.6.27.6.2.17.6.47.7.07.7.107.7.10.17.7.11
Unified Threat Defense Snort Intrusion Prevention System Engine· Cisco
90%
17.12.1a17.12.217.12.317.12.3a17.12.417.12.4a17.12.4b17.12.517.12.5a17.12.5b17.12.5c17.12.5d17.12.617.12.717.12.7a17.12.7b17.12.817.13.1a17.14.1a17.15.1a17.15.2a17.15.2c17.15.317.15.3a17.15.417.15.4c17.15.517.15.5a17.15.617.16.1a17.17.117.18.117.18.1a17.18.217.18.3a17.18.426.1.126.1.2

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHcisco
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-269

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