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CVE-2025-20145

Cisco IOS XR Software Access Control List Bypass Vulnerability

MEDIUM
5.8
CVSS Score
Published: March 12, 2025 at 04:12 PM UTC
Updated: June 17, 2026 at 08:40 AM UTC
9 products affected across 1 vendorIOS Xr88088812

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A vulnerability in the access control list (ACL) processing in the egress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability exists because certain packets are handled incorrectly when they are received on an ingress interface on one line card and destined out of an egress interface on another line card where the egress ACL is configured. 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 egress ACL on the affected device. For more information about this vulnerability, see the section of this advisory. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xr· Cisco
95%
24.1.124.1.224.2.124.2.1124.2.224.2.2024.3.124.3.224.4.16.5.16.5.26.5.36.5.926.5.936.6.16.6.26.6.256.6.36.6.47.0.17.0.117.0.127.0.147.0.27.0.907.1.17.1.27.10.17.10.27.11.17.11.27.11.217.2.17.2.127.2.27.3.17.3.157.3.167.3.27.3.37.3.47.3.57.3.67.4.17.4.27.5.17.5.127.5.27.5.37.5.47.5.57.6.17.6.27.7.17.7.27.7.217.8.17.8.27.8.227.9.17.9.2
cisco-8608 (environment) · cisco-8804 (environment) · cisco-8808 (environment) · cisco-8812 (environment) · cisco-8818 (environment) · cisco-ncs-5504 (environment) · cisco-ncs-5508 (environment) · cisco-ncs-5516 (environment)
8608· Ciscodevice
80%
All versions
8804· Ciscodevice
80%
All versions
8808· Ciscodevice
80%
All versions
8812· Ciscodevice
80%
All versions
8818· Ciscodevice
80%
All versions
Ncs 5504· Ciscodevice
80%
All versions
Ncs 5508· Ciscodevice
80%
All versions
Ncs 5516· Ciscodevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Technical Description
Source: [email protected]
https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
Vendor Advisory
Source: [email protected]
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-modular-ACL-u5MEPXMm

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-264

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