CVE-2026-20356 is a vulnerability in Cisco Cyber Vision
Published on October 21, 2026
Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
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.
Vulnerability Analysis
CVE-2026-20356 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-20356 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-20356
Want to know whenever a new CVE is published for Cisco Cyber Vision? stack.watch will email you.
Affected Versions
Cisco Cyber Vision:- Version 3.0.0 is affected.
- Version 3.0.2 is affected.
- Version 3.0.3 is affected.
- Version 3.0.1 is affected.
- Version 3.1.0 is affected.
- Version 3.0.4 is affected.
- Version 3.1.1 is affected.
- Version 3.1.2 is affected.
- Version 3.2.0 is affected.
- Version 3.0.5 is affected.
- Version 3.2.1 is affected.
- Version 3.0.6 is affected.
- Version 3.2.2 is affected.
- Version 3.2.3 is affected.
- Version 3.2.4 is affected.
- Version 4.0.0 is affected.
- Version 4.0.1 is affected.
- Version 4.0.2 is affected.
- Version 4.0.3 is affected.
- Version 4.1.0 is affected.
- Version 4.1.1 is affected.
- Version 4.1.2 is affected.
- Version 4.1.3 is affected.
- Version 4.1.4 is affected.
- Version 4.2.0 is affected.
- Version 4.2.1 is affected.
- Version 4.1.5 is affected.
- Version 4.2.2 is affected.
- Version 4.2.X is affected.
- Version 4.2.3 is affected.
- Version 4.2.4 is affected.
- Version 4.2.6 is affected.
- Version 4.1.6 is affected.
- Version 4.3.0 is affected.
- Version 4.3.1 is affected.
- Version 4.3.2 is affected.
- Version 4.3.3 is affected.
- Version 4.4.0 is affected.
- Version 4.4.1 is affected.
- Version 4.4.2 is affected.
- Version 4.4.3 is affected.
- Version 4.1.7 is affected.
- Version 5.0.0 is affected.
- Version 5.0.1 is affected.
- Version 5.0.2 is affected.
- Version 5.1.0 is affected.
- Version 5.1.1 is affected.
- Version 5.1.2 is affected.
- Version 5.1.3 is affected.
- Version 5.2.0 is affected.
- Version 5.2.1 is affected.
- Version 5.3.0 is affected.
- Version 5.3.1 is affected.
- Version 5.3.2 is affected.
- Version 5.3.3 is affected.
- Version 5.5.1 is affected.
- Version 5.6.1 is affected.
- Version 5.4.0 is affected.
- Version 5.4.1 is affected.
- Version 5.4.2 is affected.
- Version 5.7.0 is affected.
- Version 5.8.1 is affected.
- Version 5.7.1 is affected.
- Version 5.8.0 is affected.
- Version 5.5.2 is affected.
- Version 3.12.2.0 is affected.
- Version 3.1.2.0 is affected.
- Version 3.1.3.0 is affected.
- Version 3.1.4.0 is affected.
- Version 3.1.5.0 is affected.
- Version 3.1.6.0 is affected.
- Version 3.1.7.0 is affected.
- Version 3.1.8.0 is affected.
- Version 3.1.9.0 is affected.
- Version 3.1.10.0 is affected.
- Version 3.1.12.0 is affected.
- Version 3.1.13.0 is affected.
- Version 3.1.14.0 is affected.
- Version 3.1.15.0 is affected.
- Version 3.1.16.0 is affected.
- Version 3.1.17.0 is affected.
- Version 3.1.18.0 is affected.
- Version 3.1.19.0 is affected.
- Version 3.1.20.0 is affected.
- Version 3.1.21.0 is affected.
- Version 3.1.22.0 is affected.
- Version 3.1.23.0 is affected.
- Version 3.1.24.0 is affected.
- Version 3.1.25.0 is affected.
- Version 3.1.27.0 is affected.
- Version 3.1.28.0 is affected.
- Version 3.1.29.0 is affected.
- Version 3.1.30.0 is affected.
- Version 3.1.31.0 is affected.
- Version 3.1.32.0 is affected.
- Version 3.1.36.0 is affected.
- Version 3.1.38.0 is affected.
- Version 3.1.39.0 is affected.
- Version 3.1.40.0 is affected.
- Version 3.1.41.0 is affected.
- Version 3.1.42.0 is affected.
- Version 3.1.43.0 is affected.
- Version 3.1.45.0 is affected.
- Version 3.1.47.0 is affected.
- Version 3.1.48.0 is affected.
- Version 3.1.50.0 is affected.
- Version 3.1.51.0 is affected.
- Version 3.1.52.0 is affected.
- Version 3.1.53.0 is affected.
- Version 3.1.55.0 is affected.
- Version 3.1.56.0 is affected.
- Version 3.1.57.0 is affected.
- Version 3.1.58.0 is affected.
- Version 3.1.59.0 is affected.
- Version 3.1.60.0 is affected.
- Version 3.1.61.0 is affected.
- Version 3.1.62.0 is affected.
- Version 3.1.63.0 is affected.
- Version 3.1.64.0 is affected.
- Version 3.1.65.0 is affected.
- Version 3.1.66.0 is affected.
- Version 3.1.67.0 is affected.
- Version 3.1.69.0 is affected.
- Version 3.1.70.0 is affected.
- Version 3.1.71.0 is affected.
- Version 3.1.72.0 is affected.
- Version 3.1.73.0 is affected.
- Version 3.1.74.0 is affected.
- Version 3.1.75.0 is affected.
- Version 3.1.76.0 is affected.
- Version 3.1.77.0 is affected.
- Version 3.1.78.0 is affected.
- Version 3.1.81.0 is affected.
- Version 3.1.82.0 is affected.
- Version 3.1.83.0 is affected.
- Version 3.1.84.0 is affected.
- Version 3.2.1.0 is affected.
- Version 3.2.2.0 is affected.
- Version 3.3.0.0 is affected.
- Version 3.3.1.0 is affected.
- Version 3.3.2.0 is affected.
- Version 3.3.3.0 is affected.
- Version 3.3.4.0 is affected.
- Version 3.3.5.0 is affected.
- Version 3.3.7.0 is affected.
- Version 3.5.0.0 is affected.
- Version 3.5.1.0 is affected.
- Version 3.8.1.0 is affected.
- Version 3.6.0.0 is affected.
- Version 3.6.2.0 is affected.
- Version 3.9.3.0 is affected.
- Version 3.7.2.0 is affected.
- Version 3.7.0.0 is affected.
- Version 3.9.6.0 is affected.
- Version 3.10.0.0 is affected.
- Version 3.10.2.0 is affected.
- Version 3.7.4.0 is affected.
- Version 3.9.0.0 is affected.
- Version 3.5.2.0 is affected.
- Version 3.12.1.0 is affected.
- Version 3.6.1.0 is affected.
- Version 3.9.2.0 is affected.
- Version 3.6.3.0 is affected.
- Version 3.9.5.0 is affected.
- Version 3.7.1.0 is affected.
- Version 3.9.7.0 is affected.
- Version 3.7.3.0 is affected.
- Version 3.10.1.0 is affected.
- Version 3.9.1.0 is affected.
- Version 3.11.1.0 is affected.
- Version 7.0.0 is affected.
- Version 7.0.0.1 is affected.
- Version 7.0.1 is affected.
- Version 7.0.1.1 is affected.
- Version 7.0.2 is affected.
- Version 7.2.0 is affected.
- Version 7.0.2.1 is affected.
- Version 7.0.3 is affected.
- Version 7.2.0.1 is affected.
- Version 7.0.4 is affected.
- Version 7.2.1 is affected.
- Version 7.0.5 is affected.
- Version 7.3.0 is affected.
- Version 7.2.2 is affected.
- Version 7.2.3 is affected.
- Version 7.3.1 is affected.
- Version 7.2.4 is affected.
- Version 7.0.6 is affected.
- Version 7.2.5 is affected.
- Version 7.2.4.1 is affected.
- Version 7.3.1.1 is affected.
- Version 7.4.0 is affected.
- Version 7.0.6.1 is affected.
- Version 7.2.5.1 is affected.
- Version 7.4.1 is affected.
- Version 7.2.6 is affected.
- Version 7.0.6.2 is affected.
- Version 7.4.1.1 is affected.
- Version 7.2.7 is affected.
- Version 7.2.5.2 is affected.
- Version 7.3.1.2 is affected.
- Version 7.2.8 is affected.
- Version 7.6.0 is affected.
- Version 7.4.2 is affected.
- Version 7.2.8.1 is affected.
- Version 7.0.6.3 is affected.
- Version 7.4.2.1 is affected.
- Version 7.2.9 is affected.
- Version 7.0.7 is affected.
- Version 7.7.0 is affected.
- Version 7.4.2.2 is affected.
- Version 7.2.10 is affected.
- Version 7.6.1 is affected.
- Version 7.4.2.3 is affected.
- Version 7.0.8 is affected.
- Version 7.6.2 is affected.
- Version 7.7.10 is affected.
- Version 7.7.11 is affected.
- Version 7.0.8.1 is affected.
- Version 7.6.2.1 is affected.
- Version 7.7.10.1 is affected.
- Version 7.4.2.4 is affected.
- Version 7.2.10.2 is affected.
- Version 7.4.3 is affected.
- Version 7.6.4 is affected.
- Version 10.0.0 is affected.
- Version 7.4.4 is affected.
- Version 7.0.9 is affected.
- Version 7.2.11 is affected.
- Version 7.4.7 is affected.
- Version 17.12.1a is affected.
- Version 17.12.2 is affected.
- Version 17.13.1a is affected.
- Version 17.12.3 is affected.
- Version 17.14.1a is affected.
- Version 17.12.4 is affected.
- Version 17.12.3a is affected.
- Version 17.15.1a is affected.
- Version 17.16.1a is affected.
- Version 17.12.4a is affected.
- Version 17.15.2c is affected.
- Version 17.12.4b is affected.
- Version 17.15.2a is affected.
- Version 17.12.5 is affected.
- Version 17.17.1 is affected.
- Version 17.12.5a is affected.
- Version 17.15.3a is affected.
- Version 17.15.3 is affected.
- Version 17.12.5b is affected.
- Version 17.12.5c is affected.
- Version 17.15.4 is affected.
- Version 17.18.1 is affected.
- Version 17.18.1a is affected.
- Version 17.12.6 is affected.
- Version 17.15.4c is affected.
- Version 17.12.5d is affected.
- Version 17.18.2 is affected.
- Version 26.1.1 is affected.
- Version 17.15.5 is affected.
- Version 17.15.5a is affected.
- Version 17.12.7 is affected.
- Version 17.12.7a is affected.
- Version 17.12.7b is affected.
- Version 17.18.3a is affected.
- Version 17.12.8 is affected.
- Version 17.15.6 is affected.
- Version 17.18.4 is affected.
- Version 26.1.2 is affected.