CVE-2014-8100: The Render extension in XFree86 4.0.1, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xse

This month

MEDIUM 6.5DOWNGRADEUPGRADEDOWNGRADE

CVE-2014-8100 is a medium-severity flaw (CVSS 6.5) affecting xfree86, x server, x11. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Render extension in XFree86 4.0.1, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service (out-of-bounds read or write) or possibly execute arbitrary code via a crafted length or index value to the (1) ProcRenderQueryVersion, (2) SProcRenderQueryVersion, (3) SProcRenderQueryPictFormats, (4) SProcRenderQueryPictIndexValues, (5) SP

Why this priority

EPSS top 9%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2014-12-10
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: x.org

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-12-10 15:59 UTCPublished CVE record published
2026-06-17 00:16 UTCUpdated Record last modified

x.org xfree86 DOWNGRADE

Affected: 4.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.1

1. Check installed version

apt-cache policy xfree86 || rpm -q xfree86 || xfree86 --version

2. No fixed release: DOWNGRADE to a release before 4.0.1 (Debian / Ubuntu)

apt-cache madison xfree86 sudo apt install xfree86=<VERSION_BEFORE_4.0.1> sudo apt-mark hold xfree86

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xfree86 sudo dnf downgrade xfree86-<VERSION_BEFORE_4.0.1> sudo dnf versionlock add xfree86

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

x.org x server UPGRADE

Affected: <= 1.16.2.99.901

Fixed in: newer than 1.16.2.99.901

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy x-server || rpm -q x-server || x-server --version

2. UPGRADE to newer than 1.16.2.99.901 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade x-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade x-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

x.org x11 DOWNGRADE

Affected: 6.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.7

1. Check installed version

apt-cache policy x11 || rpm -q x11 || x11 --version

2. No fixed release: DOWNGRADE to a release before 6.7 (Debian / Ubuntu)

apt-cache madison x11 sudo apt install x11=<VERSION_BEFORE_6.7> sudo apt-mark hold x11

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list x11 sudo dnf downgrade x11-<VERSION_BEFORE_6.7> sudo dnf versionlock add x11

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2014-8100?

xfree86: downgrade or apply the listed mitigation; x server: upgrade to newer than 1.16.2.99.901; x11: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2014-8100 being exploited?

CVE-2014-8100 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2014-8100 affect?

CVE-2014-8100 affects xfree86, x server, x11. Severity is medium (CVSS 6.5). The Render extension in XFree86 4.0.1, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service (out-of-bounds read or write) o

How urgent is CVE-2014-8100?

Priority 46/100. EPSS top 9%: very likely to be exploited

Related CVEs

CVE-2014-8101 MEDIUM 6.5 DOWNGRADE UPGRADE The RandR extension in XFree86 4.2.0, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xser
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CVE-2014-8093 MEDIUM 6.5 DOWNGRADE UPGRADE Multiple integer overflows in the GLX extension in XFree86 4.0, X.Org X Window System (aka X11 or X) X11R6.7,
CVE-2012-1699 LOW 3.6 DOWNGRADE UPGRADE The ProcSetEventMask function in difs/events.c in the xfs font server for X.Org X11R6 through X11R6.6 and XFre

References

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