What is CVE-2023-20191?

CVE-2023-20191 is a medium-severity vulnerability in Cisco iOS Xr Software, classified under Improper Access Control. CVSS score: 5.8/10. Published 2023-09-13.

How severe is CVE-2023-20191?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Auth bypass in Cisco iOS Xr Software

CVE-2023-20191

A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incomplete support for this feature. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .

EPSS: 0.005 (37.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Cisco Ios Xr Software — versions 6.4.1, 6.5.1, 6.5.2
Cisco Ios_xr — versions 7.10

Weakness classification (CWE)

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2023-20191?: CVE-2023-20191 is a medium-severity vulnerability in Cisco iOS Xr Software, classified under Improper Access Control. CVSS score: 5.8/10. Published 2023-09-13.
How severe is CVE-2023-20191?: Medium severity. CVSS v3 base score is 5.8 out of 10.