Is CVE-2009-2055 actively exploited?

CVE-2009-2055 has no public evidence of in-the-wild exploitation as of 2026-01-12.

What is the CVSS score for CVE-2009-2055?

CVE-2009-2055 has a CVSS score of 5.9 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2009-2055?

Patch guidance is available from cisco security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2009-2055.

CVE-2009-2055 - remediation guidance & executive summary

Q: Which products are affected by CVE-2009-2055?

19 products: cisco ios xr, cisco ios xr, cisco ios xr, cisco ios xr, cisco ios xr, and 14 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-20 · Improper Input Validation CWE-20 · Improper Input Validation

Metadata

Primary Vendor: CISCO
Published: 8/19/2009
Last Modified: 1/12/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

cisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xrcisco : ios_xr

Remediation Guidance

Executive Summary

View on NIST NVD