Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability — CVE-2009-2055

Summary

Advisory CVE-2009-2055. Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability Vendor: Cisco. Source: CVE. Threat: high. CVSS 0. Known exploited in the wild. See the official advisory for details.

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Check logs/telemetry for indicators of compromise and suspicious activity.
• Consider temporary hardening: restrict access, reduce attack surface, and monitor aggressively.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

Read the official source

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