Is CVE-2013-6424 in the CISA KEV catalog?

No. CVE-2013-6424 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-6424?

CVE-2013-6424 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2013-6424?

CVE-2013-6424 has an EPSS score of 2.88% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-6424?

Upgrade xorg-server on debian 11 to 2:1.14.2.901-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2013-6424

MEDIUMEPSS 85th pctl

5.0

CVSS v2

NVD

Description

Integer underflow in the xTrapezoidValid macro in render/picture.h in X.Org allows context-dependent attackers to cause a denial of service (crash) via a negative bottom value.

CWE-191

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.14.2.901-1CVE-2013-6424

xorg-serverUbuntu

Fixed in:2:1.15.1-0ubuntu2.7USN-2500-1

xorg-server-lts-utopicUbuntu

Fixed in:2:1.16.0-1ubuntu1.2~trusty2USN-2500-1

xserver-xorg-coreUbuntu

Fixed in:2:1.15.1-0ubuntu2.7USN-2500-1

xserver-xorg-core-lts-utopicUbuntu

Fixed in:2:1.16.0-1ubuntu1.2~trusty2USN-2500-1

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

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.88%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Patch3

Third-Party Advisory7

Other references1

rhn.redhat.com

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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 2026-04-29.