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CVE-2009-2055

5.9 · MEDIUMActively Exploited

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.

Published Aug 19, 2009ciscoCWE-20EPSS 3.31%

Overview

CVE-2009-2055 is a medium-severity vulnerability affecting cisco ios_xr. It was published on August 19, 2009 and has a CVSS 3.1 base score of 5.9 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from cisco. Update ios_xr to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refmailman.nanog.org/pipermail/nanog/2009-August/012719.htmlRefsecuritytracker.com/id?1022739Refwww.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtmlRefmailman.nanog.org/pipermail/nanog/2009-August/012719.htmlRefsecuritytracker.com/id?1022739Refwww.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtmlCISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055

How CyberStrike helps

Frequently asked questions

What is CVE-2009-2055?

CVE-2009-2055 is a medium-severity vulnerability affecting cisco ios_xr. It was published on August 19, 2009 and has a CVSS 3.1 base score of 5.9 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2009-2055?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-2055?

Check the references section for vendor advisories and patches from cisco. Update ios_xr to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-2055?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-2055 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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