What is CVE-2009-0051?

CVE-2009-0051 is a vulnerability in Zxid, classified under Improper Authentication. Published 2009-01-07.

Is CVE-2009-0051 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Zxid

CVE-2009-0051

ZXID 0.29 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.

Vulnerability class: Broken Authentication

Published 2009-01-07 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.012 (66.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Zxid — versions 0.1, 0.2, 0.3

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

exchange.xforce.ibmcloud.com/vulnerabilities/47837 (vdb-entry)
www.securityfocus.com/archive/1/499827/100/0/threaded (mailing-list)
www.ocert.org/advisories/ocert-2008-016.html

Frequently asked questions

What is CVE-2009-0051?: CVE-2009-0051 is a vulnerability in Zxid, classified under Improper Authentication. Published 2009-01-07.
Is CVE-2009-0051 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.