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Fencer Vulns
medium 5.5

CVE-2020-14347 json

A flaw was found in the way xserver memory was not properly initialized.

published 2020-08-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6491

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

Patch / fix

  • x.org x_server 1.20.9
  • xorg-server Debian 14, Debian 13, Debian 12 2:1.20.9-1

debian advisories DEBIAN-CVE-2020-14347

  • xorg-server Ubuntu 16.04 LTS 2:1.18.4-0ubuntu0.9
  • xorg-server Ubuntu 18.04 LTS 2:1.19.6-1ubuntu4.5
  • xorg-server Ubuntu 20.04 LTS 2:1.20.8-2ubuntu2.3
  • xorg-server-hwe-16.04 Ubuntu 16.04 LTS 2:1.19.6-1ubuntu4.1~16.04.3
  • xorg-server-hwe-18.04 Ubuntu 18.04 LTS 2:1.20.8-2ubuntu2.2~18.04.2
  • xorg-server Ubuntu Pro 14.04 LTS 2:1.15.1-0ubuntu2.11+esm2

ubuntu advisories UBUNTU-CVE-2020-14347

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-2021:1804RHSA-2020:5408

  • xorg-x11-server SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES 12 SP3-LTSS +8 more 7.6_1.18.3-76.26.1
  • xorg-x11-server SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 1.19.6-8.16.1
  • xorg-x11-server SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 1.19.6-4.8.1
  • xorg-x11-server SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 7.4-27.122.26.1
  • xorg-x11-server SLE Workstation Extension 15 SP2, SLE Module for Development Tools 15 SP2, SLE Module for Basesystem 15 SP2 1.20.3-22.5.1
  • xorg-x11-server SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.19.6-10.8.1
  • xorg-x11-server SLE Workstation Extension 15 SP1, SLE Module for Development Tools 15 SP1, SLE Module for Basesystem 15 SP1 1.20.3-14.5.1

suse advisories SUSE-SU-2020:2331-1SUSE-SU-2020:2326-1SUSE-SU-2020:2325-1SUSE-SU-2020:14463-1SUSE-SU-2020:2240-1SUSE-SU-2020:2242-1

  • xorg-x11-server openSUSE Tumbleweed 1.20.13-1.2
  • xorg-x11-server openSUSE Leap 15.2 1.20.3-lp152.8.3.1
  • xorg-x11-server openSUSE Leap 15.1 1.20.3-lp151.4.3.1

opensuse advisories openSUSE-SU-2024:11525-1openSUSE-SU-2020:1302-1openSUSE-SU-2020:1279-1

  • 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

  • xorg-server Alpine 3.10 1.20.5-r1
  • xorg-server Alpine 3.11 1.20.6-r1
  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 1.20.8-r4

alpine advisories ALPINE-CVE-2020-14347

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

  • xorg-server Arch Linux 1.20.8-3

arch linux advisories AVG-1211

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-2020-14347 updated cvss 5.5

xorg-x11-server: Leak of uninitialized heap memory from the X server to clients in AllocatePixmap of dix/pixmap.c

  • Red Hat Enterprise Linux 5 xorg-x11-server Red Hat Enterprise Linux 6 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more
    affected: no fix available
  • 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 Enterprise Linux Client (v. 7) xorg-x11-server 1.20.4-15.el7_9, xorg-x11-server-Xorg 1.20.4-15.el7_9, xorg-x11-server-common 1.20.4-15.el7_9, xorg-x11-server-Xephyr 1.20.4-15.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-15.el7_9, xorg-x11-server-Xvfb 1.20.4-15.el7_9, xorg-x11-server-Xnest 1.20.4-15.el7_9, xorg-x11-server-source 1.20.4-15.el7_9, xorg-x11-server-Xwayland 1.20.4-15.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) xorg-x11-server 1.20.4-15.el7_9, xorg-x11-server-Xdmx 1.20.4-15.el7_9, xorg-x11-server-Xorg 1.20.4-15.el7_9, xorg-x11-server-Xvfb 1.20.4-15.el7_9, xorg-x11-server-Xnest 1.20.4-15.el7_9, xorg-x11-server-common 1.20.4-15.el7_9, +3 more Red Hat Enterprise Linux Server (v. 7) xorg-x11-server 1.20.4-15.el7_9, xorg-x11-server-Xorg 1.20.4-15.el7_9, xorg-x11-server-common 1.20.4-15.el7_9, xorg-x11-server-Xephyr 1.20.4-15.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-15.el7_9, xorg-x11-server-Xvfb 1.20.4-15.el7_9, xorg-x11-server-Xnest 1.20.4-15.el7_9, xorg-x11-server-source 1.20.4-15.el7_9, xorg-x11-server-Xwayland 1.20.4-15.el7_9 Red Hat Enterprise Linux Workstation (v. 7) xorg-x11-server 1.20.4-15.el7_9, xorg-x11-server-Xorg 1.20.4-15.el7_9, xorg-x11-server-common 1.20.4-15.el7_9, xorg-x11-server-Xephyr 1.20.4-15.el7_9
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx 1.20.4-15.el7_9, xorg-x11-server-Xvfb 1.20.4-15.el7_9, xorg-x11-server-Xnest 1.20.4-15.el7_9, xorg-x11-server-source 1.20.4-15.el7_9, xorg-x11-server-Xwayland 1.20.4-15.el7_9
    fixed: vendor fix RHSA-2020:5408

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

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • The Xorg Project xorg-x11-server

Classification

Weakness

References

Sources

Fencer Vulns 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.