What is CVE-2023-20233?

CVE-2023-20233 is a medium-severity vulnerability in Cisco iOS Xr Software, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2023-09-13.

How severe is CVE-2023-20233?

Medium severity. CVSS v3 base score is 4.3 out of 10.

NULL pointer dereference in Cisco iOS Xr Software

CVE-2023-20233

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.

EPSS: 0.003 (19.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

Cisco Ios Xr Software — versions 5.2.0, 5.2.1, 5.2.2
Cisco Ios_xr — versions 7.9.0

Weakness classification (CWE)

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2023-20233?: CVE-2023-20233 is a medium-severity vulnerability in Cisco iOS Xr Software, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2023-09-13.
How severe is CVE-2023-20233?: Medium severity. CVSS v3 base score is 4.3 out of 10.