Cisco IOS XR CFM DoS via Crafted CCMs
CVE-2023-20233 Published on September 13, 2023
A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.
Vulnerability Analysis
CVE-2023-20233 can be exploited with network access, requires 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
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2023-20233
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Affected Versions
Cisco IOS XR Software:- Version 5.2.0 is affected.
- Version 5.2.1 is affected.
- Version 5.2.2 is affected.
- Version 5.2.4 is affected.
- Version 5.2.3 is affected.
- Version 5.2.5 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 5.3.4 is affected.
- Version 6.1.1 is affected.
- Version 6.1.2 is affected.
- Version 6.1.3 is affected.
- Version 6.1.4 is affected.
- Version 6.2.1 is affected.
- Version 6.2.2 is affected.
- Version 6.2.3 is affected.
- Version 6.2.25 is affected.
- Version 6.3.2 is affected.
- Version 6.3.3 is affected.
- Version 6.3.15 is affected.
- Version 6.4.1 is affected.
- Version 6.4.2 is affected.
- Version 6.4.3 is affected.
- Version 6.5.1 is affected.
- Version 6.5.2 is affected.
- Version 6.6.2 is affected.
- Version 6.6.3 is affected.
- Version 6.6.25 is affected.
- Version 6.6.4 is affected.
- Version 7.0.1 is affected.
- Version 7.0.2 is affected.
- Version 7.1.1 is affected.
- Version 7.1.15 is affected.
- Version 7.1.2 is affected.
- Version 7.1.3 is affected.
- Version 6.7.1 is affected.
- Version 6.7.2 is affected.
- Version 6.7.3 is affected.
- Version 6.7.4 is affected.
- Version 7.2.1 is affected.
- Version 7.2.2 is affected.
- Version 7.3.1 is affected.
- Version 7.3.2 is affected.
- Version 7.3.3 is affected.
- Version 7.4.1 is affected.
- Version 7.4.2 is affected.
- Version 6.8.1 is affected.
- Version 6.8.2 is affected.
- Version 7.5.1 is affected.
- Version 7.5.3 is affected.
- Version 7.5.2 is affected.
- Version 7.6.1 is affected.
- Version 7.6.2 is affected.
- Version 7.7.1 is affected.
- Version 7.7.2 is affected.
- Version 6.9.1 is affected.
- Version 6.9.2 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.