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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…

Medium5.8EPSS 0.60%
Published
Updated
Reserved
Assigned by
cisco

Description

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 .

Scores

CVSS scores of CVE-2023-20191, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.60% · top 51% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.

Weakness

Affected products

  • Cisco · Cisco IOS XR Software

    • affected 6.4.1
    • affected 6.5.1
    • affected 6.5.2
    • affected 6.5.3
    • affected 6.6.2
    • affected 6.6.3
    • affected 6.6.25
    • affected 6.6.4
    • affected 7.0.1
    • affected 7.0.2
    • affected 7.1.1
    • affected 7.1.2
    • affected 7.2.1
    • affected 7.2.2
    • affected 7.3.1
    • affected 7.3.2
    • affected 7.3.3
    • affected 7.3.5
    • affected 7.4.1
    • affected 7.4.2
    • affected 7.5.1
    • affected 7.5.3
    • affected 7.5.2
    • affected 7.5.4
    • affected 7.6.1
    • affected 7.6.2
    • affected 7.7.1
    • affected 7.7.2
    • affected 7.8.1
    • affected 7.8.2
    • affected 7.9.1

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2023-20191 badge
[![CVE-2023-20191](https://trackcve.app/badge/CVE-2023-20191.svg)](https://trackcve.app/cve/CVE-2023-20191)

Record last updated .