CVE-2017-12186

xorg-x11-server before 1.19.5 was missing length validation in X-Resource extension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

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

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1509216	Exploit Issue Tracking Patch Third Party Advisory VDB Entry
https://cgit.freedesktop.org/xorg/xserver/commit/?id=cad5a1050b7184d828aef9c1dd151c3ab649d37e	Patch Third Party Advisory
https://www.debian.org/security/2017/dsa-4000	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1509216	Exploit Issue Tracking Patch Third Party Advisory VDB Entry
https://cgit.freedesktop.org/xorg/xserver/commit/?id=cad5a1050b7184d828aef9c1dd151c3ab649d37e	Patch Third Party Advisory
https://www.debian.org/security/2017/dsa-4000	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:debian:debian_linux:8.0:::::::*
	cpe:2.3:o:debian:debian_linux:9.0:::::::*

Configuration 2 (hide)

cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*

History

29 Aug 2025, 13:42

Type	Values Removed	Values Added
CPE	cpe:2.3:a:x.org:xorg-server::::::::	cpe:2.3:a:x.org:x_server::::::::
First Time		X.org x Server

Information

Published : 2018-01-24 15:29

Updated : 2025-08-29 13:42

NVD link : CVE-2017-12186

Mitre link : CVE-2017-12186

CVE.ORG link : CVE-2017-12186

JSON object : View

Products Affected

x.org

x_server

debian

debian_linux

CWE

CWE-391

Unchecked Error Condition

CWE-20

Improper Input Validation

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