Is CVE-2017-13721 in the CISA KEV catalog?

No. CVE-2017-13721 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-13721?

CVE-2017-13721 has a CVSS v3 base score of 4.7 (MEDIUM).

What is the EPSS score for CVE-2017-13721?

CVE-2017-13721 has an EPSS score of 0.36% (28th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-13721?

Upgrade xorg-server on debian 11 to 2:1.19.4-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2017-13721

MEDIUM

4.7

CVSS v3

NVD

Description

In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.

CWE-269Improper Privilege Management

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.19.4-1CVE-2017-13721

xorg-serverUbuntu

Fixed in:2:1.15.1-0ubuntu2.10USN-3453-1

Fixed in:2:1.18.4-0ubuntu0.6USN-3453-1

xorg-server-hwe-16.04Ubuntu

Fixed in:2:1.19.3-1ubuntu1~16.04.3USN-3453-1

xorg-server-lts-xenialUbuntu

Fixed in:2:1.18.3-1ubuntu2.3~trusty3USN-3453-1

xserver-xorg-coreUbuntu

Fixed in:2:1.15.1-0ubuntu2.10USN-3453-1

Fixed in:2:1.18.4-0ubuntu0.6USN-3453-1

xserver-xorg-core-hwe-16.04Ubuntu

Fixed in:2:1.19.3-1ubuntu1~16.04.3USN-3453-1

xserver-xorg-core-lts-xenialUbuntu

Fixed in:2:1.18.3-1ubuntu2.3~trusty3USN-3453-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.36%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Vendor Advisory1

lists.x.org

Third-Party Advisory5

Related Vulnerabilities

Other CWE-269 (Improper Privilege Management) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12635	Critical	9.8	100%	-	Fix
CVE-2022-24637	Critical	9.8	99%	-	Fix
CVE-2017-5689	Critical	9.8	92%	KEV	Fix
CVE-2020-3243	Critical	9.8	88%	-	-
CVE-2024-21888	High	8.8	87%	-	-
CVE-2022-0441	Critical	9.8	85%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.