CVE-2021-3481: A flaw was found in Qt

This month

HIGH 7.1DOWNGRADE

CVE-2021-3481 is a high-severity flaw (CVSS 7.1) affecting qt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Qt. An out-of-bounds read vulnerability was found in QRadialFetchSimd in qt/qtbase/src/gui/painting/qdrawhelper_p.h in Qt/Qtbase. While rendering and displaying a crafted Scalable Vector Graphics (SVG) file this flaw may lead to an unauthorized memory access. The highest threat from this vulnerability is to data confidentiality and the application availability.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-125
Published	2022-08-22
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2022-08-22 15:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

qt qt DOWNGRADE

Affected: 5.15.1 · 6.0.0 · 6.0.2 · 6.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.15.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.15.1 (Debian / Ubuntu)

apt-cache madison qt sudo apt install qt=<VERSION_BEFORE_5.15.1> sudo apt-mark hold qt

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

dnf --showduplicates list qt sudo dnf downgrade qt-<VERSION_BEFORE_5.15.1> 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-2021-3481?

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

Is CVE-2021-3481 being exploited?

CVE-2021-3481 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-2021-3481 affect?

CVE-2021-3481 affects qt. Severity is high (CVSS 7.1). A flaw was found in Qt. An out-of-bounds read vulnerability was found in QRadialFetchSimd in qt/qtbase/src/gui/painting/qdrawhelper_p.h in Qt/Qtbase. While rendering and displaying a crafted Scalable Vector Graphics (SVG) file this flaw may

How urgent is CVE-2021-3481?

Priority 41/100. High severity; Public exploit reference

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References

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