CVEvulnerability

CVE-2009-2055

5.9 MEDIUM Known exploited Published 2009-08-19 Modified 2026-06-16 Official page ↗

CISA Known Exploited Vulnerability

Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability — Cisco IOS XR

Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).

Added to KEV: 2022-03-25
Remediation due: 2022-04-15
Ransomware use: Unknown
Required action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2009-2055

Status: Analyzed
Published: 2009-08-19
Last modified: 2026-06-16
Assigner: [email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected]): 4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:N/A:P
Weaknesses: CWE-20

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.

Affected configurations

• cisco ios xr 3.4 • cisco ios xr 3.4.0 • cisco ios xr 3.4.1 • cisco ios xr 3.4.2 • cisco ios xr 3.4.3 • cisco ios xr 3.5 • cisco ios xr 3.5.2 • cisco ios xr 3.5.3 • cisco ios xr 3.5.4 • cisco ios xr 3.6.0 • cisco ios xr 3.6.1 • cisco ios xr 3.6.2 • cisco ios xr 3.6.3 • cisco ios xr 3.7.0 • cisco ios xr 3.7.1 • cisco ios xr 3.7.2 • cisco ios xr 3.7.3 • cisco ios xr 3.8.0 • cisco ios xr 3.8.1

Weakness · CWE (1)

CWE-20 Improper Input Validation weakness

References