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CVE-2009-0129

15
FAUCET Score

CVE-2009-0129 describes a vulnerability in libcrypt-openssl-dsa-perl where improper checking of OpenSSL DSA_verify and DSA_do_verify return values could allow remote attackers to bypass certificate chain validation using a malformed SSL/TLS signature. This issue affects perl-openssl and libcrypt-openssl-dsa-perl. The vulnerability has a CVSS score of 5.0, indicating a medium severity. It is a network-based attack with low complexity, requiring no authentication, and could lead to partial confidentiality impact. There is no evidence of active exploitation, nor are there known public exploits available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are minimal, suggesting low public attention.

Impacted Technologies

VendorProductVersion(s)CPE
_nil_CPE matchmatch criteria
cpe:2.3:a:perl-openssl:libcrypt-openssl-dsa-perl:_nil_:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 40th percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-0129Important

perl-Crypt-OpenSSL-DSA: do_verify() doesn't fail on errors in OpenSSL DSA_do_verify()

Jan 11, 2009

References

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