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CVE-2017-12185

28
FAUCET Score

CVE-2017-12185 describes a critical vulnerability in xorg-x11-server versions prior to 1.19.5, affecting Debian and X.Org X servers. The flaw stems from missing length validation in the MIT-SCREEN-SAVER extension, allowing a malicious X client to crash the X server or potentially execute arbitrary code. With a CVSS score of 9.8 (Critical), this vulnerability is network-exploitable with low attack complexity, leading to high impacts on confidentiality, integrity, and availability. While no public exploit intelligence like Metasploit or ExploitDB entries exist, and there's minimal community discussion or media coverage, its high FAUCET Risk Score of 80/100 indicates significant inherent risk.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
< 1.19.5CPE matchmatch criteria
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.17%
Probability of exploitation in next 30 days
EPSS Percentile
89.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0417 is in the 83rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xorg-x11-server
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: xorg-x11-server
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-server

Vendor Advisories (1)

redhatCVE-2017-12185Moderate

xorg-x11-server: unvalidated lengths in MIT-SCREEN-SAVER extension

Oct 10, 2017

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party AdvisoryVDB Entry
cgit.freedesktop.org / xorg/xserver/commit
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2017/11/msg00032.html
Mailing ListThird Party Advisory
debian.org / security/2017/dsa-4000
Third Party Advisory