CVE-2025-20159

Cisco IOS XR Software Management Interface ACL Bypass Vulnerability

Published Sep 10, 2025 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the management interface access control list (ACL) processing feature in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass configured ACLs for the SSH, NetConf, and gRPC features.

This vulnerability exists because management interface ACLs have not been supported on Cisco IOS XR Software Packet I/O infrastructure platforms for Linux-handled features such as SSH, NetConf, or gRPC. An attacker could exploit this vulnerability by attempting to send traffic to an affected device. A successful exploit could allow the attacker to bypass an ingress ACL that is applied on the management interface of the affected device.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco IOS XR Software

unknown

Version	Status	Constraints
`6.6.1`	affected	—
`6.5.3`	affected	—
`7.0.1`	affected	—
`6.6.11`	affected	—
`6.5.1`	affected	—
`6.5.2`	affected	—
`6.6.2`	affected	—
`6.6.12`	affected	—
`6.6.25`	affected	—
`7.1.1`	affected	—
`7.0.90`	affected	—
`6.6.3`	affected	—
`7.0.2`	affected	—
`7.1.2`	affected	—
`7.2.1`	affected	—
`7.0.11`	affected	—
`7.0.12`	affected	—
`7.0.14`	affected	—
`6.6.4`	affected	—
`7.2.12`	affected	—
`7.3.1`	affected	—
`7.4.1`	affected	—
`7.2.2`	affected	—
`7.3.15`	affected	—
`7.3.16`	affected	—
`7.4.15`	affected	—
`7.3.2`	affected	—
`7.5.1`	affected	—
`7.4.16`	affected	—
`7.3.27`	affected	—
`7.6.1`	affected	—
`7.5.2`	affected	—
`7.8.1`	affected	—
`7.6.15`	affected	—
`7.5.12`	affected	—
`7.8.12`	affected	—
`7.3.4`	affected	—
`7.3.3`	affected	—
`7.4.2`	affected	—
`7.7.1`	affected	—
`7.6.2`	affected	—
`7.5.3`	affected	—
`7.7.2`	affected	—
`7.9.1`	affected	—
`7.10.1`	affected	—
`7.8.2`	affected	—
`7.5.4`	affected	—
`7.8.22`	affected	—
`7.7.21`	affected	—
`7.9.2`	affected	—
`7.3.5`	affected	—
`7.5.5`	affected	—
`7.11.1`	affected	—
`7.10.2`	affected	—
`24.1.1`	affected	—
`7.3.6`	affected	—
`7.5.52`	affected	—
`7.11.2`	affected	—
`24.2.1`	affected	—
`24.1.2`	affected	—
`24.2.11`	affected	—
`24.3.1`	affected	—
`24.4.1`	affected	—
`24.2.2`	affected	—
`7.11.21`	affected	—
`24.2.20`	affected	—
`24.3.2`	affected	—
`25.1.1`	affected	—
`24.4.2`	affected	—
`24.3.20`	affected	—
`25.1.2`	affected	—
`24.3.30`	affected	—
`24.4.30`	affected	—
`24.2.21`	affected	—

No data.

Vendor	Product	Versions
Cisco	Ios Xr Software	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-27574	A vulnerability in the management interface access control list (ACL) processing feature in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass configured ACLs for the SSH, NetConf, and gRPC features. This vulnerability exists because management interface ACLs have not been supported on Cisco IOS XR Software Packet I/O infrastructure platforms for Linux-handled features such as SSH, NetConf, or gRPC. An attacker could exploit this vulnerability by attempting to send traffic to an affected device. A successful exploit could allow the attacker to bypass an ingress ACL that is applied on the management interface of the affected device.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.331% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-acl-packetio-Swjhhbtz

History

Sep 11, 2025 10:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco ios Xr Software
Vendors & Products		Cisco Cisco ios Xr Software

Sep 10, 2025 7:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 10, 2025 4:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the management interface access control list (ACL) processing feature in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass configured ACLs for the SSH, NetConf, and gRPC features. This vulnerability exists because management interface ACLs have not been supported on Cisco IOS XR Software Packet I/O infrastructure platforms for Linux-handled features such as SSH, NetConf, or gRPC. An attacker could exploit this vulnerability by attempting to send traffic to an affected device. A successful exploit could allow the attacker to bypass an ingress ACL that is applied on the management interface of the affected device.
Title		Cisco IOS XR Software Management Interface ACL Bypass Vulnerability
Weaknesses		CWE-284
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-acl-packetio-Swjhhbtz
Metrics		cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}`