Cisco Snort 3 D.E. DoS via Malformed RPC Parsing
CVE-2026-20068 Published on March 4, 2026
Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability
Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.
This vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. An attacker could exploit this vulnerability by sending crafted RPC packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Vulnerability Analysis
CVE-2026-20068 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 small impact on availability.
Weakness Type
Uncaught Exception
An exception is thrown from a function, but it is not caught. When an exception is not caught, it may cause the program to crash or expose sensitive information.
Products Associated with CVE-2026-20068
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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 7.2.4 is affected.
- Version 7.2.5 is affected.
- Version 7.2.4.1 is affected.
- Version 7.4.0 is affected.
- Version 7.2.5.1 is affected.
- Version 7.4.1 is affected.
- Version 7.2.6 is affected.
- Version 7.4.1.1 is affected.
- Version 7.2.7 is affected.
- Version 7.2.5.2 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 7.4.2.1 is affected.
- Version 7.2.9 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 7.6.2 is affected.
- Version 7.7.10 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 17.3.1a is affected.
- Version 17.2.1r is affected.
- Version 17.3.2 is affected.
- Version 17.4.1a is affected.
- Version 17.5.1 is affected.
- Version 17.3.3 is affected.
- Version 17.5.1a is affected.
- Version 17.3.4 is affected.
- Version 17.3.4a is affected.
- Version 17.4.2 is affected.
- Version 17.4.1b is affected.
- Version 17.6.1a is affected.
- Version 17.7.1a is affected.
- Version 17.6.2 is affected.
- Version 17.8.1a is affected.
- Version 17.3.5 is affected.
- Version 17.6.3 is affected.
- Version 17.6.3a is affected.
- Version 17.7.2 is affected.
- Version 17.9.1a is affected.
- Version 17.6.4 is affected.
- Version 17.10.1a is affected.
- Version 17.3.6 is affected.
- Version 17.3.7 is affected.
- Version 17.9.2a is affected.
- Version 17.6.5 is affected.
- Version 17.11.1a is affected.
- Version 17.9.3a is affected.
- Version 17.12.1a is affected.
- Version 17.9.4 is affected.
- Version 17.6.6 is affected.
- Version 17.3.8 is affected.
- Version 17.3.8a is affected.
- Version 17.6.6a is affected.
- Version 17.9.4a is affected.
- Version 17.12.2 is affected.
- Version 17.13.1a is affected.
- Version 17.9.5a is affected.
- Version 17.12.3 is affected.
- Version 17.6.7 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 17.6.8 is affected.
- Version 17.9.6 is affected.
- Version 17.6.8a is affected.
- Version 17.16.1a is affected.
- Version 17.9.5e is affected.
- Version 17.12.4a is affected.
- Version 17.15.2c is affected.
- Version 17.9.5f 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 17.9.7a 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 17.9.7b is affected.
- Version 17.18.1 is affected.
- Version 17.18.1a is affected.
- Version 17.12.6 is affected.
- Version 17.9.8 is affected.
- Version 17.15.4c is affected.
- Version 17.12.5d is affected.
- Version 17.18.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.