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Fencer Intel
high 7.5

CVE-2013-7439 json

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…

published 11y ago modified 4mo ago also EUVD-2013-7203

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • libx11 Debian 14, Debian 13, Debian 12 2:1.6.0-1

debian advisories DEBIAN-CVE-2013-7439

  • libxrender Ubuntu 14.04 LTS 1:0.9.8-1build0.14.04.1

ubuntu advisories UBUNTU-CVE-2013-7439

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libXi RHEL 6 1.7.2-2.2.el6
  • libXp RHEL 6 1.0.2-2.1.el6
  • libXt RHEL 6 1.1.4-6.1.el6
  • libXv RHEL 6 1.0.9-2.1.el6
  • libdmx RHEL 6 1.1.3-3.el6
  • libX11 RHEL 6 1.6.0-2.2.el6
  • libxcb RHEL 6 1.9.1-2.el6
  • libXext RHEL 6 1.3.2-2.1.el6

red hat advisories RHSA-2014:1436

  • xorg-x11-libX11 SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +9 more 7.4-5.11.15.1

suse advisories SUSE-SU-2015:1334-1

Is CVE-2013-7439 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-7439 updated cvss 2.9

libX11: buffer overflow in MakeBigReq macro

  • Red Hat Enterprise Linux 5 libX11
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Desktop (v. 6) libdmx 1.1.3-3.el6, libxcb 1.9.1-2.el6, libXi 1.7.2-2.2.el6, libXp 1.0.2-2.1.el6, libXt 1.1.4-6.1.el6, libXv 1.0.9-2.1.el6, +14 more Red Hat Enterprise Linux Desktop Optional (v. 6) libdmx 1.1.3-3.el6, xcb-proto 1.8-3.el6, libxcb-python 1.9.1-2.el6, libXxf86dga 1.1.4-2.1.el6 Red Hat Enterprise Linux HPC Node (v. 6) libxcb 1.9.1-2.el6, libXi 1.7.2-2.2.el6, libXp 1.0.2-2.1.el6, libXt 1.1.4-6.1.el6, libXv 1.0.9-2.1.el6, libX11 1.6.0-2.2.el6, +9 more Red Hat Enterprise Linux HPC Node Optional (v. 6) libdmx 1.1.3-3.el6, xcb-proto 1.8-3.el6, libXres 1.0.7-2.1.el6, libxcb-python 1.9.1-2.el6, libXxf86dga 1.1.4-2.1.el6, xkeyboard-config 2.11-1.el6 Red Hat Enterprise Linux Server (v. 6) libdmx 1.1.3-3.el6, libxcb 1.9.1-2.el6, libXi 1.7.2-2.2.el6, libXp 1.0.2-2.1.el6, libXt 1.1.4-6.1.el6, libXv 1.0.9-2.1.el6, +14 more Red Hat Enterprise Linux Server Optional (v. 6) libdmx 1.1.3-3.el6, xcb-proto 1.8-3.el6, libxcb-python 1.9.1-2.el6, libXxf86dga 1.1.4-2.1.el6
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) libdmx 1.1.3-3.el6, libxcb 1.9.1-2.el6, libXi 1.7.2-2.2.el6, libXp 1.0.2-2.1.el6, libXt 1.1.4-6.1.el6, libXv 1.0.9-2.1.el6, +14 more Red Hat Enterprise Linux Workstation Optional (v. 6) libdmx 1.1.3-3.el6, xcb-proto 1.8-3.el6, libxcb-python 1.9.1-2.el6, libXxf86dga 1.1.4-2.1.el6
    fixed: vendor fix RHSA-2014:1436
  • Red Hat Enterprise Linux 7 libX11, libX11-common
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.25% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.