CVE-2012-1699: The ProcSetEventMask function in difs/events.c in the xfs font server for X.Org X11R6 through X11R6.6 and XFre

Q: How do I fix CVE-2012-1699?

x.org x11: downgrade or apply the listed mitigation; xfree86: upgrade to newer than 3.3.2. Exact commands for each OS are on this page.

Q: Is CVE-2012-1699 being exploited?

CVE-2012-1699 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-2012-1699 affect?

CVE-2012-1699 affects x.org x11, xfree86. Severity is low (CVSS 3.6). The ProcSetEventMask function in difs/events.c in the xfs font server for X.Org X11R6 through X11R6.6 and XFree86 before 3.3.3 calls the SendErrToClient function with a mask value instead of a pointer, which allows local users to cause a de

Q: How urgent is CVE-2012-1699?

Priority 20/100. No elevated risk signals yet.

Routine

LOW 3.6DOWNGRADEUPGRADE

CVE-2012-1699 is a low-severity flaw (CVSS 3.6) affecting x.org x11, xfree86. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The ProcSetEventMask function in difs/events.c in the xfs font server for X.Org X11R6 through X11R6.6 and XFree86 before 3.3.3 calls the SendErrToClient function with a mask value instead of a pointer, which allows local users to cause a denial of service (memory corruption and crash) or obtain potentially sensitive information from memory via a SetEventMask request that triggers an invalid pointer dereference.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.6 (Low)
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-119
Published	2012-12-21
Last modified	2026-06-16

Publisher (CNA): Oracle · Vendor: x · xfree86

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

Am I affected?

Timeline

2012-12-21 05:46 UTCPublished CVE record published
2026-06-16 23:40 UTCUpdated Record last modified

x x.org x11 DOWNGRADE

Affected: 6.0 · 6.1 · 6.3 · 6.4 · 6.5.1 · 6.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy x.org-x11 || rpm -q x.org-x11 || x.org-x11 --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison x.org-x11 sudo apt install x.org-x11=<VERSION_BEFORE_6.0> sudo apt-mark hold x.org-x11

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

dnf --showduplicates list x.org-x11 sudo dnf downgrade x.org-x11-<VERSION_BEFORE_6.0> sudo dnf versionlock add x.org-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.

xfree86 xfree86 UPGRADE

Affected: <= 3.3.2

Fixed in: newer than 3.3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xfree86

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xfree86

Note

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

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-2012-1699?

x.org x11: downgrade or apply the listed mitigation; xfree86: upgrade to newer than 3.3.2. Exact commands for each OS are on this page.

Is CVE-2012-1699 being exploited?

CVE-2012-1699 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-2012-1699 affect?

CVE-2012-1699 affects x.org x11, xfree86. Severity is low (CVSS 3.6). The ProcSetEventMask function in difs/events.c in the xfs font server for X.Org X11R6 through X11R6.6 and XFree86 before 3.3.3 calls the SendErrToClient function with a mask value instead of a pointer, which allows local users to cause a de

How urgent is CVE-2012-1699?

Priority 20/100. No elevated risk signals yet.

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CVE-2012-0064 MEDIUM 4.6 UPGRADE UPGRADE xkeyboard-config before 2.5 in X.Org before 7.6 enables certain XKB debugging functions by default, which allo

References

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