CVE-2017-12178
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.42%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.42% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-391, CWE-20
- Affected
- debian/debian linux · x.org/x server
- Source
- secalert@redhat.com
EPSS 4.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1509219Issue Tracking, Patch, Third Party Advisory, VDB Entry
- https://cgit.freedesktop.org/xorg/xserver/commit/?id=859b08d523307eebde7724fd1a0789c44813e821Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201711-05Third Party Advisory, VDB Entry
- https://www.debian.org/security/2017/dsa-4000Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1509219Issue Tracking, Patch, Third Party Advisory, VDB Entry
- https://cgit.freedesktop.org/xorg/xserver/commit/?id=859b08d523307eebde7724fd1a0789c44813e821Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201711-05Third Party Advisory, VDB Entry
- https://www.debian.org/security/2017/dsa-4000Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.