CVE-2017-12186

Exp

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.

Published: 2018-01-24 Last update: 2025-08-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-12186 is rated High Exploit Risk (79.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.75%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-12186

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-12186

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-27 0.79% 0.75% -0.04%
2 2025-03-30 2.90% 0.79% -2.11%
3 2025-03-29 — 2.90% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-12186

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-12186

OS Trackers for CVE-2017-12186

vendor priority summary link
alpine — CVE-2017-12186: 1 source package rows (xorg-server); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2017-12186
debian not yet assigned CVE-2017-12186 not yet assigned priority: Debian including 1 source packages (xorg-server), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-12186
redhat medium — https://access.redhat.com/security/cve/CVE-2017-12186
suse medium CVE-2017-12186 severity moderate: SUSE including 14 source package names (xorg-x11-Xvnc, xorg-x11-Xvnc-7.4-27.122.16.1, …), 56 product×package rows across 21 product lines (SUSE Linux Enterprise Desktop 12 SP2, SUSE Linux Enterprise Desktop 12 SP3, … (21 product lines)): Fixed 29, Known Not Affected 27. https://www.suse.com/security/cve/CVE-2017-12186/
ubuntu medium CVE-2017-12186 medium priority: Ubuntu including 8 source packages (xorg, xorg-hwe-16.04, …), 32 status rows across 4 suites (trusty, upstream, xenial, zesty): DNE 16, released 8, not-affected 5, needs-triage 3. https://ubuntu.com/security/CVE-2017-12186

Affected software / configurations for CVE-2017-12186

Vendor Product Version Raw CPE
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
x.org x_server < 1.19.5 cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*

References for CVE-2017-12186

cvelogic Threat Intelligence