What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2023-20191.

What is the severity rating of CVE-2023-20191?

CVE-2023-20191 has a severity rating of 7.5 (high).

How does this vulnerability affect Cisco IOS XR Software?

This vulnerability affects Cisco IOS XR Software versions up to 7.7.21, versions between 7.8 and 7.9.2, and version 7.10.

What is the impact of exploiting this vulnerability?

Exploiting this vulnerability could allow an unauthenticated, remote attacker to bypass a configured ACL.

How can I fix this vulnerability?

To fix this vulnerability, Cisco IOS XR Software users should upgrade to a fixed release as indicated in the Cisco Security Advisory.

Vulnerability/
CVE-2023-20191

high

7.5

CWE

863 284

13/9/2023

25/1/2024

CVE-2023-20191

First published: Wed Sep 13 2023(Updated: )

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 .

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XR	<7.7.21
Cisco IOS XR	>=7.8<7.9.2
Cisco IOS XR	=7.10
Cisco IOS XR	<7.7.21
Cisco IOS XR	>=7.8<7.9.2
Cisco IOS XR	=7.10

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-dnx-acl-PyzDkeYF

Frequently Asked Questions

What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2023-20191.
What is the severity rating of CVE-2023-20191?
CVE-2023-20191 has a severity rating of 7.5 (high).
How does this vulnerability affect Cisco IOS XR Software?
This vulnerability affects Cisco IOS XR Software versions up to 7.7.21, versions between 7.8 and 7.9.2, and version 7.10.
What is the impact of exploiting this vulnerability?
Exploiting this vulnerability could allow an unauthenticated, remote attacker to bypass a configured ACL.
How can I fix this vulnerability?
To fix this vulnerability, Cisco IOS XR Software users should upgrade to a fixed release as indicated in the Cisco Security Advisory.

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