Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Aug 19, 2009 · Catalog

   Detected

   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.

2. Mar 25, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Apr 15, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Affected

• cpe cisco/ios xr3.4
• cpe cisco/ios xr3.4.0
• cpe cisco/ios xr3.4.1
• cpe cisco/ios xr3.4.2
• cpe cisco/ios xr3.4.3
• cpe cisco/ios xr3.5
• cpe cisco/ios xr3.5.2
• cpe cisco/ios xr3.5.3
• vendor Cisco IOS XRversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-2009-2055

  Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).

  cisa.gov
• CVE.orgVulnerability recordCVE-2009-2055

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2009-2055

  30-day exploitation probability 3.3%

  first.org
• NIST NVDVulnerability recordCVE-2009-2055

  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.

  nvd.nist.gov

References

• Mailing List · mailman.nanog.org
• Broken Link · securitytracker.com
• Patch · cisco.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov