CVE-2009-2055 | BDVDB-2026-37973 Detail

CiscoIOS XR

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-20 Improper Input Validation

References#

Exploit#

No public exploit known

History#

Version 12009-08-19Record published in the CVE List.
Version 22026-01-12Most recent update recorded in the CVE List.

Published

Published: 2009-08-19
Last modified: 2026-01-12

Vendor information

Vendor: Cisco
Product: IOS XR

All Cisco vulnerabilities

Score

5.9 Medium

EPSS

3.3%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 88.7.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Input Validation

Action

Apply updates per vendor instructions.

Affected Systems

No version data in the source record.

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.9 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).