CVE DATABASE / CVE-2009-2055
CVE-2009-2055
Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
CVSS 5.9 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-03-25.
Federal remediation due 2022-04-15.
Required action: Apply updates per vendor instructions.
Summary
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.
CVSS 3.1 breakdown
| Base score | 5.9 (MEDIUM) |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity | NONE |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Cisco ios xr
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References
- http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html
- http://securitytracker.com/id?1022739
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055
Data: NIST NVD + CISA KEV. NVD last modified 2026-04-22. Always verify against the vendor advisory before acting.