What is CVE-2009-0129?

CVE-2009-0129 is a vulnerability in Perl-Openssl Libcrypt-Openssl-Dsa-Perl, classified under Improper Authentication. Published 2009-01-15.

Is CVE-2009-0129 known to be exploited?

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

Auth bypass in Perl-Openssl Libcrypt-Openssl-Dsa-Perl

CVE-2009-0129

libcrypt-openssl-dsa-perl does not properly check the return value from the OpenSSL DSA_verify and DSA_do_verify functions, which might allow 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 2009-01-15 · 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: 0.011 (64.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Perl-Openssl Libcrypt-Openssl-Dsa-Perl — versions _nil_

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

openwall.com/lists/oss-security/2009/01/12/4 (mailing-list)
bugs.debian.org/cgi-bin/bugreport.cgi (Exploit)

Frequently asked questions

What is CVE-2009-0129?: CVE-2009-0129 is a vulnerability in Perl-Openssl Libcrypt-Openssl-Dsa-Perl, classified under Improper Authentication. Published 2009-01-15.
Is CVE-2009-0129 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.