CVE-2009-2055
Medium 5.9 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
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.
Metrics
- CVSS 3.1
-
5.9 (MEDIUM)
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 3% (percentile: 89) as of 1 November 2026
- CWE
- CWE-20
Affected products
cisco: ios xr
References
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.… PatchVendor Advisory
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.… PatchVendor Advisory
- http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html Mailing List
- http://securitytracker.com/id?1022739 Broken Link
- http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html Mailing List
- http://securitytracker.com/id?1022739 Broken Link
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009… US Government Resource