Access Control Bypass in Cisco IOS XR Software
CVE-2025-20159

5.3MEDIUM

Key Information:

Vendor

Cisco
Status
Cisco iOS Xr Software
Vendor
CVE Published:
10 September 2025

Badges

👾 Exploit Exists

What is CVE-2025-20159?

A flaw in the management interface's access control list (ACL) processing in Cisco IOS XR Software permits an unauthenticated, remote attacker to bypass established ACLs. This vulnerability arises due to the lack of support for management interface ACLs on the Packet I/O infrastructure, which affects features such as SSH, NetConf, and gRPC. An attacker can exploit this vulnerability by sending traffic to a device running the affected software, potentially bypassing ingress ACLs and gaining unauthorized access to the management interface.

Affected Version(s)

Cisco IOS XR Software 6.6.1

Cisco IOS XR Software 6.5.3

Cisco IOS XR Software 7.0.1

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-20159 : Access Control Bypass in Cisco IOS XR Software