CVE-2009-2055
Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run IOS XR, fix it now.
CISA required action: Apply updates per vendor instructions.
US federal civilian agencies must remediate by Apr 15, 2022.
Patch status
Official fix available since
Apply the vendor's update to every affected system. Check the fixed-in versions below where known.
Basis: NVD patch reference
Description
Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
Affected products
| Product | Vendor | Affected versions | Source |
|---|---|---|---|
| IOS XR | Cisco | 3.4; 3.4.0; 3.4.1; 3.4.2; 3.4.3; 3.5 | KEV |
Sources: KEV = CISA Known Exploited Vulnerabilities catalog.
Intelligence timeline
Developments from the last 30 days, newest first.
- CVSS scoredUpdateKEV
CVE-2009-2055 scored CVSS 5.9: Cisco IOS XR, Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
CISA lists this as exploited in the wild. Unpatched IOS XR systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
- Patch releasedUpdateKEV
Patch released for CVE-2009-2055: Cisco IOS XR, Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
An official fix is now available for Cisco IOS XR. This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference
1 earlier event is available with a subscription. See plans.
Coverage
We have not published a story about this vulnerability yet.