CVE-2009-2055
Published: March 25, 2022
Official Description
Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).
CISA KEV Advisory
Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability
Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Cisco IOS XR, when BGP is configured, allows remote attackers to cause a denial-of-service (DoS) condition. While an older CVE, its inclusion in CISA's KEV catalog and an EPSS score of 0.00409 indicate confirmed active exploitation, making it a relevant concern for affected systems.
This flaw is actively exploited in the wild, as confirmed by its presence in CISA's KEV catalog. Attackers can remotely trigger a denial-of-service condition on affected Cisco IOS XR devices.
Administrators should ensure Cisco IOS XR devices are running the latest patched versions. Reviewing BGP configurations and implementing best practices for network hardening are also recommended.
Technical Analysis
CVE-2009-2055 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2009-2055 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2009-2055 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1