Cisco IOS XR Software for ASR 9000 Series Routers Layer 3 Multicast Routing Denial of Service Vulnerability
Priority LOW 38CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0054 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco IOS XR Software | 7.11.1; 7.9.21; 7.10.2; 24.1.1; 7.11.2; 24.2.1; 24.1.2; 24.3.1; 24.2.2; 7.11.21; 24.3.2 | — | No fix listed | CNA |
- Cisco IOS XR Software VendorCisco Affected 7.11.1; 7.9.21; 7.10.2; 24.1.1; 7.11.2; 24.2.1; 24.1.2; 24.3.1; 24.2.2; 7.11.21; 24.3.2 Fixed in — No fix listed CNA
CPE configurations NVD · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:* | 7.9.21 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:* | 7.10.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:* | 7.11.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:* | 7.11.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:7.11.21:*:*:*:*:*:*:* | 7.11.21 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:* | 24.1.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:* | 24.1.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:* | 24.2.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:24.2.2:*:*:*:*:*:*:* | 24.2.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xr:24.3.1:*:*:*:*:*:*:* | 24.3.1 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:* Versions 7.9.21 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:* Versions 7.10.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:* Versions 7.11.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:* Versions 7.11.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:7.11.21:*:*:*:*:*:*:* Versions 7.11.21 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:* Versions 24.1.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:* Versions 24.1.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:* Versions 24.2.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:24.2.2:*:*:*:*:*:*:* Versions 24.2.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xr:24.3.1:*:*:*:*:*:*:* Versions 24.3.1 Vulnerable ·Cisco
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xr:24.3.2:*:*:*:*:*:*:* | 24.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ios_xr:24.3.2:*:*:*:*:*:*:* Versions 24.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-20146
- 2026-10-03 Alias added: GHSA-f6jg-88p5-x574
References
Advisory 1
More Cisco Ios Xr vulnerabilities
- TI-2020-02680 Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
- TI-2020-03113 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities KEVCVSS 3.1HIGH 8.6
- TI-2020-03110 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability KEVCVSS 3.1HIGH 8.6
- TI-2018-00142 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.0
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
Sources
- CVE-2025-20146 · CVE Program
- CVE-2025-20146 · NVD
- FIRST EPSS
- GHSA-f6jg-88p5-x574 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences