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Fencer Intel
medium 6.7

CVE-2020-14344 json

An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client...

published 6y ago modified 3mo ago also EUVD-2020-6488 , GHSA-g6cq-58wq-v493 , JLSEC-2026-469

cvss
6.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia Xorg_libX11_jll 1.8.6+0
  • x.org libx11 1.6.10
  • libx11 Debian 14, Debian 13, Debian 12 2:1.6.10-1

debian advisories DEBIAN-CVE-2020-14344

  • libx11 Ubuntu 16.04 LTS 2:1.6.3-1ubuntu2.2
  • libx11 Ubuntu 18.04 LTS 2:1.6.4-3ubuntu0.3
  • libx11 Ubuntu 20.04 LTS 2:1.6.9-2ubuntu1.1
  • libx11 Ubuntu Pro 14.04 LTS 2:1.6.2-1ubuntu2.1+esm1

ubuntu advisories UBUNTU-CVE-2020-14344

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mesa RHEL 8 20.3.3-2.el8
  • libdrm RHEL 8 2.4.103-1.el8
  • libX11 RHEL 8 1.6.8-4.el8
  • libglvnd RHEL 8 1:1.3.2-1.el8
  • libinput RHEL 8 1.16.3-1.el8
  • libwacom RHEL 8 1.6-2.el8
  • libX11-xcb RHEL 8 1.6.8-4.el8
  • mesa-libGL RHEL 8 20.3.3-2.el8

red hat advisories RHSA-2021:1804

  • libX11 SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 1.6.5-3.9.1
  • libX11 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 1.6.2-12.12.1
  • xorg-x11-libX11 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 7.4-5.11.72.18.1
  • xorg-x11-libX11 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 7.4-5.11.72.15.1
  • libX11 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 1.6.2-12.8.1
  • libxcb SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 1.10-4.5.1
  • libX11 SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 1.6.5-3.6.2
  • libxcb SLES for SAP 15, SLES 15-LTSS, SLE Module for Desktop Applications 15 SP2 +5 more 1.13-3.5.1

suse advisories SUSE-SU-2020:2197-1SUSE-SU-2020:2196-1SUSE-SU-2020:14447-1SUSE-SU-2020:14445-1SUSE-SU-2020:2117-1SUSE-SU-2020:2116-1

  • libX11 openSUSE Tumbleweed 1.7.2-1.2
  • libX11 openSUSE Leap 15.1 1.6.5-lp151.4.6.1
  • libX11 openSUSE Leap 15.2 1.6.5-lp152.5.6.1
  • libX11 openSUSE Leap 15.2 1.6.5-lp152.5.3.1
  • libxcb openSUSE Leap 15.2 1.13-lp152.5.3.1
  • libX11 openSUSE Leap 15.1 1.6.5-lp151.4.3.1
  • libxcb openSUSE Leap 15.1 1.13-lp151.4.3.1

opensuse advisories openSUSE-SU-2024:10918-1openSUSE-SU-2020:1198-1openSUSE-SU-2020:1182-1openSUSE-SU-2020:1164-1openSUSE-SU-2020:1162-1

  • libglvnd AlmaLinux 8 1:1.3.2-1.el8
  • libglvnd-egl AlmaLinux 8 1:1.3.2-1.el8
  • libglvnd-glx AlmaLinux 8 1:1.3.2-1.el8
  • libglvnd-gles AlmaLinux 8 1:1.3.2-1.el8
  • libglvnd-opengl AlmaLinux 8 1:1.3.2-1.el8
  • xorg-x11-drivers AlmaLinux 8 7.7-30.el8
  • xorg-x11-server-source AlmaLinux 8 1.20.10-1.el8

almalinux advisories ALSA-2021:1804

  • mesa Rocky Linux 8 20.3.3-2.el8
  • libdrm Rocky Linux 8 2.4.103-1.el8
  • libX11 Rocky Linux 8 1.6.8-4.el8
  • libglvnd Rocky Linux 8 1:1.3.2-1.el8
  • libinput Rocky Linux 8 1.16.3-1.el8
  • libwacom Rocky Linux 8 1.6-2.el8
  • egl-wayland Rocky Linux 8 1.1.5-3.el8
  • xorg-x11-server Rocky Linux 8 1.20.10-1.el8

rocky linux advisories RLSA-2021:1804

  • libx11 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.6.10-r0

alpine advisories ALPINE-CVE-2020-14344

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libx11 Arch Linux 1.6.10-1

arch linux advisories AVG-1212

Is CVE-2020-14344 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14344 updated cvss 6.7

libX11: Heap overflow in the X input method client

  • Red Hat Enterprise Linux 5 libX11 Red Hat Enterprise Linux 6 libX11, libX11-common
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libX11, libX11-common
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) xorg-x11-server-source 1.20.10-1.el8 Red Hat Enterprise Linux AppStream (v. 8) mesa 20.3.3-2.el8, libwacom 1.6-2.el8, libX11 1.6.8-4.el8, libdrm 2.4.103-1.el8, libglvnd 1.3.2-1.el8, libinput 1.16.3-1.el8, +28 more
    fixed: vendor fix RHSA-2021:1804

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia Xorg_libX11_jll
<1.8.6+0
1.8.6+0

Affected products

  • The X11 Project libX11

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.