CVE-2011-3194: Buffer overflow in the TIFF reader in gui/image/qtiffhandler.cpp in Qt 4.7.4 allows remote attackers to cause

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HIGH 9.3DOWNGRADE

CVE-2011-3194 is a high-severity flaw (CVSS 9.3) affecting qt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the TIFF reader in gui/image/qtiffhandler.cpp in Qt 4.7.4 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via the TIFFTAG_SAMPLESPERPIXEL tag in a greyscale TIFF image with multiple samples per pixel.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	6.9% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2012-06-16
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2012-06-16 00:55 UTCPublished CVE record published
2026-06-16 23:32 UTCUpdated Record last modified

qt qt DOWNGRADE

Affected: 4.7.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.7.4 (Debian / Ubuntu)

apt-cache madison qt sudo apt install qt=<VERSION_BEFORE_4.7.4> sudo apt-mark hold qt

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

dnf --showduplicates list qt sudo dnf downgrade qt-<VERSION_BEFORE_4.7.4> sudo dnf versionlock add qt

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-2011-3194?

qt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-3194 being exploited?

CVE-2011-3194 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-2011-3194 affect?

CVE-2011-3194 affects qt. Severity is high (CVSS 9.3). Buffer overflow in the TIFF reader in gui/image/qtiffhandler.cpp in Qt 4.7.4 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via the TIFFTAG_SAMPLESPERPIXEL tag in a greyscale TIFF image with

How urgent is CVE-2011-3194?

Priority 56/100. Critical severity; EPSS top 6%: very likely to be exploited

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References

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