PatchTheCVECVE-2009-0051: ZXID 0.29 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which all
CVE-2009-0051 is a medium-severity flaw (CVSS 5.0) affecting zxid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.0 (Medium) |
| EPSS exploit chance | 1.2% (top 32%) |
| CISA exploited list | No |
| Weakness | CWE-287 |
| Published | 2009-01-07 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2009-0051?
zxid: upgrade to newer than 0.29. Exact commands for each OS are on this page.
Is CVE-2009-0051 being exploited?
CVE-2009-0051 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2009-0051 affect?
CVE-2009-0051 affects zxid. Severity is medium (CVSS 5.0). 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 C
How urgent is CVE-2009-0051?
Priority 39/100. On your watchlist