How severe is CVE-2009-2055?

CVE-2009-2055 has a CVSS 3.1 base score of 5.9 (MEDIUM). EPSS estimates a 3.3% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2009-2055: Cisco IOS XR Border Gateway Protocol (BGP)

CISA Known Exploited Vulnerabilities

Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-03-25

Remediation due

2022-04-15

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2009-2055

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.

Severity

CVSS 3.1 · CISA5.9 MEDIUM

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
-	-	n/a

References

3 Links

Vendor advisories

20090818 Cisco IOS XR Software Border Gateway Protocol Vulnerability

Mailing lists

[nanog] 20090817 RE: Anyone else seeing "(invalid or corrupt AS path) 3 bytes E01100" ?

Vulnerability databases

1022739

Record Details

Published

2009-08-19

Last updated

2026-01-12

Assigner (CNA)

cisco

Credited to

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.