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

Source: https://junglewise.ai/threats/cve-2009-2055-cisco-ios-xr-border-gateway-protocol-bgp-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-25. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2009-2055 · Severity: critical · CVSS 5.9 · Exploited in the wild · Published 2022-03-25

Cisco IOS XR allows remote attackers to cause a denial of service (BGP session reset) via a BGP UPDATE message containing an invalid attribute. This vulnerability specifically impacts systems where BGP is the configured routing feature.

Technologies: [Cisco IOS XR](https://junglewise.ai/threats/technologies/ios-xr). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2009-2055 exploited in the wild?** Yes. CVE-2009-2055 is known to be exploited in the wild, first recorded on 25 March 2022. Treat it as urgent.

**How severe is CVE-2009-2055?** Critical severity, with a CVSS score of 5.9, published 25 March 2022.

**Which products and versions are affected?** Cisco IOS XR 3.4.0 through 3.8.1.

**Is there a fix for CVE-2009-2055?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2009-2055 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2009-2055?** Check whether you run Cisco IOS XR. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Cisco IOS XR 3.4.0 through 3.8.1

## Timeline

- 2009-08-17: exploited: Demonstrated in the wild.
- 2009-08-19: disclosed: NVD Published Date.
- 2022-03-25: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.

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