CVE-2017-12178

9.8 criticalEPSS 4.4%

xorg-x11-server before 1.19.5 had wrong extra length check in ProcXIChangeHierarchy function allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 4.4% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
CWEs: CWE-20, CWE-391
Published: 2018-01-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

debian:debian_linux
x.org:x_server

References

https://bugzilla.redhat.com/show_bug.cgi?id=1509219
https://cgit.freedesktop.org/xorg/xserver/commit/?id=859b08d523307eebde7724fd1a0789c44813e821
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
https://security.gentoo.org/glsa/201711-05
https://www.debian.org/security/2017/dsa-4000

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