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Fencer Vulns
medium 4.7

CVE-2017-13721 json

In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension en…

published 2017-10-09 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-5238

cvss
4.7
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.

Patch / fix

  • xorg-server Debian 14, Debian 13, Debian 12 2:1.19.4-1

debian advisories DEBIAN-CVE-2017-13721

  • xorg-server Ubuntu 14.04 LTS 2:1.15.1-0ubuntu2.10
  • xorg-server Ubuntu 16.04 LTS 2:1.18.4-0ubuntu0.6
  • xorg-server-hwe-16.04 Ubuntu 16.04 LTS 2:1.19.3-1ubuntu1~16.04.3
  • xorg-server-lts-xenial Ubuntu 14.04 LTS 2:1.18.3-1ubuntu2.3~trusty3

ubuntu advisories UBUNTU-CVE-2017-13721

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

  • xorg-x11-server SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 7.6_1.18.3-76.15.2

suse advisories SUSE-SU-2017:3047-1

  • xorg-x11-server openSUSE Tumbleweed 1.20.13-1.2

opensuse advisories openSUSE-SU-2024:11525-1

  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 1.19.5-r0

alpine advisories ALPINE-CVE-2017-13721

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 1.19.4-1

arch linux advisories AVG-432

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-2017-13721 updated cvss 3.6

xorg-x11-server: Insufficient validation of shmseg resource id

  • 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 Red Hat Enterprise Linux 7 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more
    affected: no fix planned “Will not fix”
  • 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
    not affected: vulnerable code not present

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

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 4.7 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-269 Improper Privilege Management

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.