CVE Tools
Sign in

CVE-2025-20144

Cisco IOS XR Software Access Control List Bypass Vulnerability

Published: Mar 12, 2025Updated: Aug 4, 2025 Sources: CVE List NVD BDUCWE-284
NVD MITRE
4.0CVSSMEDIUM
EPSS Score
0.3%
Top 76.3%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

Description

A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device. For more information, see the section of this advisory. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-284NVD-CWE-noinfo

Affected Products

Cisco IOS XR SoftwareCisco
On-premNetwork Device
Networking Infrastructure / router-switch
ios xrcisco
EmbeddedNetwork Device
Networking Infrastructure / router-switch
Cisco IOS XRCisco Systems Inc.
On-premNetwork Device
Networking Infrastructure / router-switch
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ
sec.cloudapps.cisco.com
https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
blog.apnic.net
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ
sec.cloudapps.cisco.com

Timeline

Published
Mar 12, 2025
Last Updated
Aug 4, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-20144 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows