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Vulnerability record · CVE-2017-12178 · published 24 January 2018

CVE-2017-12178: Debian linux improper input validation vulnerability

Debian · Debian Linux

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.

9.8 CVSS 3.0 Critical EPSS 4.2% · top 9.5% CWE-391 · CWE-391CWE-20 · Improper input validation
9.8CVSS 3.0 base score, v2 7.5
4.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1509219 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://cgit.freedesktop.org/xorg/xserver/commit/?id=859b08d523307eebde7724fd1a0789c44813e821 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201711-05 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2017/dsa-4000 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1509219 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://cgit.freedesktop.org/xorg/xserver/commit/?id=859b08d523307eebde7724fd1a0789c44813e821 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201711-05 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2017/dsa-4000 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-12178), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.