What is CVE-2009-2055?

CVE-2009-2055 is a medium-severity vulnerability in Cisco Ios_xr, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2009-08-19.

How severe is CVE-2009-2055?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2009-2055 known to be exploited?

Yes. CVE-2009-2055 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Improper input validation in Cisco Ios_xr

CVE-2009-2055

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.033 (87.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cisco Ios_xr — versions 3.4, 3.4.0, 3.4.1
N/a — versions n/a

Weakness classification (CWE)

CWE-20 — Improper Input Validation

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-15.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

psirt@cisco.com (mailing-list, x_refsource_MLIST, Mailing List)
psirt@cisco.com (vdb-entry, x_refsource_SECTRACK, Broken Link)
psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Patch, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2009-2055?: CVE-2009-2055 is a medium-severity vulnerability in Cisco Ios_xr, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2009-08-19.
How severe is CVE-2009-2055?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2009-2055 known to be exploited?: Yes. CVE-2009-2055 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.