NULL pointer dereference in Cisco IOS XR - CVE-2023-20233
Published: September 14, 2023
Vulnerability identifier: #VU80771
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-20233
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect processing of invalid continuity check messages (CCMs) in the Connectivity Fault Management (CFM) feature. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
Cisco IOS XR
How to mitigate CVE-2023-20233
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 7.5.4, 7.6.3, 7.7.21, 7.8.2, 7.9.1