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CVE-2017-13721

19
FAUCET Score

CVE-2017-13721 describes a vulnerability in X.Org Server versions prior to 1.19.4, affecting Debian and X.Org X server products. An authenticated attacker can exploit this flaw to cause denial-of-service by aborting the X server or manipulating shared memory segments of other clients within the same session. With a CVSS score of 4.7 (Medium), this vulnerability requires local access and high attack complexity, primarily impacting availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.19.3CPE matchmatch criteria
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

4.7MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.0
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
28.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 77th percentile among its peer group of 1,297 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 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-2017-13721Low

xorg-x11-server: Insufficient validation of shmseg resource id

Oct 4, 2017

References

cgit.freedesktop.org / xorg/xserver/commit
Third Party Advisory
lists.x.org / archives/xorg-announce/2017-October/002808.html
Vendor Advisory
security.gentoo.org / glsa/201710-30
Third Party Advisory
debian.org / security/2017/dsa-4000
Third Party Advisory
openwall.com / lists/oss-security/2017/10/04/10
Mailing ListThird Party Advisory
securityfocus.com / bid/101238
Third Party AdvisoryVDB Entry