ACL Bypass on MPLS Interfaces in Cisco IOS XR Ingress
CVE-2023-20191 Published on September 13, 2023
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 .
Vulnerability Analysis
CVE-2023-20191 can be exploited 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, with no impact on integrity, and no impact on availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2023-20191 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2023-20191
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Affected Versions
Cisco IOS XR Software:- Version 6.4.1 is affected.
- Version 6.5.1 is affected.
- Version 6.5.2 is affected.
- Version 6.5.3 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 7.1.2 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 7.3.5 is affected.
- Version 7.4.1 is affected.
- Version 7.4.2 is affected.
- Version 7.5.1 is affected.
- Version 7.5.3 is affected.
- Version 7.5.2 is affected.
- Version 7.5.4 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 7.8.1 is affected.
- Version 7.8.2 is affected.
- Version 7.9.1 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.