CVE-2007-2437: The X render (Xrender) extension in X.org X Window System 7.0, 7.1, and 7.2, with Xserver 1.3.0 and earlier, a

Q: How do I fix CVE-2007-2437?

x window system: downgrade or apply the listed mitigation; xserver: upgrade to newer than 1.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2007-2437 being exploited?

CVE-2007-2437 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2007-2437 affect?

CVE-2007-2437 affects x window system, xserver. Severity is medium (CVSS 5.5). The X render (Xrender) extension in X.org X Window System 7.0, 7.1, and 7.2, with Xserver 1.3.0 and earlier, allows remote authenticated users to cause a denial of service (daemon crash) via crafted values to the (1) XRenderCompositeTrapezo

Q: How urgent is CVE-2007-2437?

Priority 47/100. EPSS top 9%: very likely to be exploited; Public exploit reference

This month

MEDIUM 5.5DOWNGRADEUPGRADE

CVE-2007-2437 is a medium-severity flaw (CVSS 5.5) affecting x window system, xserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The X render (Xrender) extension in X.org X Window System 7.0, 7.1, and 7.2, with Xserver 1.3.0 and earlier, allows remote authenticated users to cause a denial of service (daemon crash) via crafted values to the (1) XRenderCompositeTrapezoids and (2) XRenderAddTraps functions, which trigger a divide-by-zero error.

Why this priority

EPSS top 9%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Published	2007-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: x.org

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-05-02 10:19 UTCPublished CVE record published
2026-06-16 22:39 UTCUpdated Record last modified

x.org x window system DOWNGRADE

Affected: 7.0 · 7.1 · 7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

1. Check installed version

apt-cache policy x-window-system || rpm -q x-window-system || x-window-system --version

2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison x-window-system sudo apt install x-window-system=<VERSION_BEFORE_7.0> sudo apt-mark hold x-window-system

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

dnf --showduplicates list x-window-system sudo dnf downgrade x-window-system-<VERSION_BEFORE_7.0> sudo dnf versionlock add x-window-system

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 xserver UPGRADE

Affected: <= 1.3.0

Fixed in: newer than 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xserver

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: X.Org X Window System Xserver 1.3 - XRender Extension Divide by Zero Denial of Service

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-2007-2437?

x window system: downgrade or apply the listed mitigation; xserver: upgrade to newer than 1.3.0. Exact commands for each OS are on this page.

Is CVE-2007-2437 being exploited?

CVE-2007-2437 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-2007-2437 affect?

CVE-2007-2437 affects x window system, xserver. Severity is medium (CVSS 5.5). The X render (Xrender) extension in X.org X Window System 7.0, 7.1, and 7.2, with Xserver 1.3.0 and earlier, allows remote authenticated users to cause a denial of service (daemon crash) via crafted values to the (1) XRenderCompositeTrapezo

How urgent is CVE-2007-2437?

Priority 47/100. EPSS top 9%: very likely to be exploited; Public exploit reference

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References

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