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 .
problem types: Improper Access Control
affected:
{
vendor: Cisco
product: Cisco IOS XR Software
versions:
version: 6.4.1, status: affected
version: 6.5.1, status: affected
version: 6.5.2, status: affected
version: 6.5.3, status: affected
version: 6.6.2, status: affected
version: 6.6.3, status: affected
version: 6.6.25, status: affected
version: 6.6.4, status: affected
version: 7.0.1, status: affected
version: 7.0.2, status: affected
version: 7.1.1, status: affected
version: 7.1.2, status: affected
version: 7.2.1, status: affected
version: 7.2.2, status: affected
version: 7.3.1, status: affected
version: 7.3.2, status: affected
version: 7.3.3, status: affected
version: 7.3.5, status: affected
version: 7.4.1, status: affected
version: 7.4.2, status: affected
version: 7.5.1, status: affected
version: 7.5.3, status: affected
version: 7.5.2, status: affected
version: 7.5.4, status: affected
version: 7.6.1, status: affected
version: 7.6.2, status: affected
version: 7.7.1, status: affected
version: 7.7.2, status: affected
version: 7.8.1, status: affected
version: 7.8.2, status: affected
version: 7.9.1, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
baseScore: 5.8
baseSeverity: MEDIUM
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: LOW
availabilityImpact: NONE
]
exploits: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.