Is CVE-2013-7439 in the CISA KEV catalog?

No. CVE-2013-7439 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-7439?

CVE-2013-7439 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2013-7439?

CVE-2013-7439 has an EPSS score of 4.28% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-7439?

Upgrade libx11 on debian 11 to 2:1.6.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2013-7439

HIGHEPSS 90th pctl

7.5

CVSS v2

NVD

Description

Multiple off-by-one errors in the (1) MakeBigReq and (2) SetReqLen macros in include/X11/Xlibint.h in X11R6.x and libX11 before 1.6.0 allow remote attackers to have unspecified impact via a crafted request, which triggers a buffer overflow.

CWE-189

How to fix

Remediation Available

libx11Debian

Fixed in:2:1.6.0-1CVE-2013-7439

libxrenderUbuntu

Fixed in:1:0.9.8-1build0.14.04.1USN-2568-1

libxrender1Ubuntu

Fixed in:1:0.9.8-1build0.14.04.1USN-2568-1

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

4.28%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

lists.x.org

Third-Party Advisory4

Issue Tracking1

bugs.freedesktop.org

Other references1

oracle.com

Related Vulnerabilities

Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1538	High	10.0	99%	-	-
CVE-2006-3747	High	7.6	96%	-	Fix
CVE-2007-0071	High	9.3	93%	-	-
CVE-2015-3829	High	10.0	90%	-	-
CVE-2015-3864	High	10.0	87%	-	-
CVE-2015-1539	High	10.0	86%	-	-

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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 2026-05-06.