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CISA KEV · Known exploitedMedium

CVE-2009-2055

Cisco IOS XR

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
5.9
EPSS
3.33%
87.4% percentile
CISA KEV
Listed
Published
2009.08.20
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability3.33%
Technical severityCVSS 5.9

Vulnerability overview

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 product and versions

Product
Cisco IOS XR
Affected versions
3.4, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.5, 3.5.2, 3.5.3, 3.5.4, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.7.0, 3.7.1, 3.7.2, 3.7.3, 3.8.0, 3.8.1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.04.15
  1. 1
    Identify

    Confirm that Cisco IOS XR and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-20
KEV added
2022.03.25
Ransomware use
미확인
CVE-2009-2055 — Cisco IOS XR | SECUFOCUS NOW