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CVE-2017-2624

24
FAUCET Score

CVE-2017-2624 is a time-based side-channel vulnerability affecting xorg-x11-server versions prior to 1.19.0, including those in Debian distributions. This flaw allows an attacker to efficiently brute-force MIT cookies due to timing differences in memcmp() implementations when validating Xorg session cookies. With a CVSS score of 7.0 (HIGH), this vulnerability has a local attack vector with high attack complexity, but could lead to high impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.19.4CPE matchmatch criteria
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.4
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.67%
Probability of exploitation in next 30 days
EPSS Percentile
48.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0067 is in the 85th percentile among its peer group of 1,525 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

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-2017-2624Low

xorg-x11-server: timing attack against MIT Cookie

Feb 28, 2017

References

bugzilla.redhat.com / show_bug.cgi
ExploitIssue TrackingThird Party Advisory
gitlab.freedesktop.org / xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2017/11/msg00032.html
Third Party Advisory
security.gentoo.org / glsa/201704-03
Third Party Advisory
security.gentoo.org / glsa/201710-30
Third Party Advisory
x41-dsec.de / lab/advisories/x41-2017-001-xorg
ExploitThird Party Advisory
securityfocus.com / bid/96480
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037919
Third Party AdvisoryVDB Entry