CVE-2009-2055

5.9 MEDIUM CISA KEV - Actively Exploited

Published: August 19, 2009 Modified: January 12, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html

Source: psirt@cisco.com

Mailing List

http://securitytracker.com/id?1022739

Source: psirt@cisco.com

Broken Link

http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml

Source: psirt@cisco.com

Patch Vendor Advisory

http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://securitytracker.com/id?1022739

Source: af854a3a-2127-422b-91ae-364da2661108

Broken Link

http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml

Source: af854a3a-2127-422b-91ae-364da2661108

Patch Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

7 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.9 / 10.0

EPSS (Exploit Probability)

0.4%

61th percentile

Exploitation Status

Actively Exploited

Remediation due: 2022-04-15

Weaknesses (CWE)

CWE-20 CWE-20

Affected Vendors

cisco

Related CVEs