Denial of service in Cisco IOS XR Software for ASR 9000 Series Routers
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2025-20146 |
| CWE-ID | CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Cisco IOS XR Operating systems & Components / Operating system Cisco ASR 9000 Series Aggregation Services Routers Hardware solutions / Routers & switches, VoIP, GSM, etc ASR 9902 Compact High-Performance Routers Hardware solutions / Routers & switches, VoIP, GSM, etc ASR 9903 Compact High-Performance Routers Hardware solutions / Routers & switches, VoIP, GSM, etc |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) Input validation error
EUVDB-ID: #VU105693
Risk: High
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2025-20146
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists 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. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsCisco IOS XR: 7.9.21 - 24.3
Cisco ASR 9000 Series Aggregation Services Routers: All versions
ASR 9902 Compact High-Performance Routers: All versions
ASR 9903 Compact High-Performance Routers: All versions
CPE2.3- cpe:2.3:o:cisco_systems:cisco_ios_xr:7.9.21:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_ios_xr:7.11:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_ios_xr:24.1:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_ios_xr:24.2:*:*:*:*:*:*:*
- cpe:2.3:o:cisco_systems:cisco_ios_xr:24.3:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:cisco_asr_9000_series_aggregation_services_routers:*:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:asr_9902_compact_high-performance_routers:*:*:*:*:*:*:*:*
- cpe:2.3:h:cisco_systems:asr_9903_compact_high-performance_routers:*:*:*:*:*:*:*:*
http://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-multicast-ERMrSvq7
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
