A vulnerability in the Layer 3 multicast feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed IPv4 multicast packets that are received on line cards where the interface has either an IPv4 access control list (ACL) or a QoS policy applied. An attacker could exploit this vulnerability by sending crafted IPv4 multicast packets through an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset. Traffic over that line card would be lost while the line card reloads.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Cisco
  • Asr 9006
  • Asr 9010
  • Asr 9901
  • Asr 9902
  • Asr 9903
  • Asr 9904
  • Asr 9906
  • Asr 9910
  • Asr 9912
  • Asr 9922
  • Ios Xr

Configuration 1 [-]

AND
OR cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.2:*:*:*:*:*:*:*
OR cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*

No data.

References
Link Providers
https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ cve-icon cve-icon
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-multicast-ERMrSvq7 cve-icon cve-icon
History

Fri, 01 Aug 2025 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco asr 9006
Cisco asr 9010
Cisco asr 9901
Cisco asr 9902
Cisco asr 9903
Cisco asr 9904
Cisco asr 9906
Cisco asr 9910
Cisco asr 9912
Cisco asr 9922
Cisco ios Xr
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.3.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:*
Vendors & Products Cisco
Cisco asr 9006
Cisco asr 9010
Cisco asr 9901
Cisco asr 9902
Cisco asr 9903
Cisco asr 9904
Cisco asr 9906
Cisco asr 9910
Cisco asr 9912
Cisco asr 9922
Cisco ios Xr

Sat, 12 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00157}

 epss

{'score': 0.00186}

Fri, 21 Mar 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 12 Mar 2025 16:15:00 +0000

Type Values Removed Values Added
Description A vulnerability in the Layer 3 multicast feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed IPv4 multicast packets that are received on line cards where the interface has either an IPv4 access control list (ACL) or a QoS policy applied. An attacker could exploit this vulnerability by sending crafted IPv4 multicast packets through an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset. Traffic over that line card would be lost while the line card reloads.
Title Cisco IOS XR Software for ASR 9000 Series Routers Layer 3 Multicast Routing Denial of Service Vulnerability
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2025-03-12T16:12:56.245Z

Updated: 2025-03-21T20:27:39.497Z

Reserved: 2024-10-10T19:15:13.215Z

Link: CVE-2025-20146

cve-icon Vulnrichment

Updated: 2025-03-21T20:27:29.549Z

cve-icon NVD

Status : Analyzed

Published: 2025-03-12T16:15:22.197

Modified: 2025-08-01T18:50:42.947

Link: CVE-2025-20146

cve-icon Redhat

No data.