CVE-2009-2055VulnerabilityPublished 03/25/2022Updated 10/24/2026

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

Affects Cisco IOS XRSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/25/2022
KEV deadline: 04/15/2022
EPSS: 3.3% chance of exploitation in 30 days – higher than 88% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2009-2055 (opens in a new tab)

Description

CVE-2009-2055 is a high-severity vulnerability in Cisco IOS XR when Border Gateway Protocol (BGP) is configured. It allows remote attackers to cause a denial-of-service (DoS) condition. The vulnerability has been exploited in the wild. No specific affected versions or patch information are provided in the available data.

Summary

Cisco IOS XR, when configured with BGP routing, contains a vulnerability (CVE-2009-2055) that permits remote attackers to cause a denial-of-service condition. The vulnerability is classified under CWE-20 (Improper Input Validation). Exploitation of this flaw can disrupt network routing services by impacting the BGP feature. The vulnerability has been observed to be exploited in the wild, indicating active threat usage. No detailed version or patch information is provided in the source data.

Impact

Successful exploitation results in denial-of-service, disrupting BGP routing functionality on affected Cisco IOS XR devices. This can lead to network outages or degraded routing performance. The vulnerability is known to be exploited in the wild, increasing the risk to affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or workaround information is provided, users should consult Cisco's official advisories for updates. Until a fix is available, consider limiting exposure of BGP interfaces to untrusted networks and monitoring for unusual BGP activity.

Weaknesses

CWE-20Improper Input Validation (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:55:45 UTC

Weaknesses

References

Related threats