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HIGH

CVE-2021-3481

CVSS v3

7.1

HIGH

EPSS Score

0.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • adwaita-qt5AlmaLinux:8all versions · fixed in 1.2.1-3.el8and 1 other package
  • python3-qt5AlmaLinux:8all versions · fixed in 5.15.0-2.el8and 3 other packages
  • qgnomeplatformAlmaLinux:8all versions · fixed in 0.7.1-2.el8
  • qt5-develAlmaLinux:8all versions · fixed in 5.15.2-1.el8and 4 other packages
  • qt5-qtbaseAlmaLinux:8all versions · fixed in 5.15.2-3.el8and 28 other packages
  • qt5-qtcanvas3dAlmaLinux:8all versions · fixed in 5.12.5-3.el8and 1 other package
  • qt5-qtdeclarativeAlmaLinux:8all versions · fixed in 5.15.2-2.el8and 45 other packages
  • sipAlmaLinux:8all versions · fixed in 4.19.24-2.el8and 3 other packages

Vendor advisories

  • CVE-2021-3481 Red Hat Product Security1,262 products fixed · 44 known affected

    qt: Out of bounds read in function QRadialFetchSimd from crafted svg file

    phonon-backend-gstreamer as a component of Red Hat Enterprise Linux 6 · qt as a component of Red Hat Enterprise Linux 6 · qt-demos as a component of Red Hat Enterprise Linux 6

  • RHSA-2021:4172 Red Hat Product Security1,262 products fixed

    Red Hat Security Advisory: qt5 security, bug fix, and enhancement update

Full record on NVD

Description

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.

Technical details

Published
2022-08-22

Frequently asked questions

What is CVE-2021-3481?

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.

Is CVE-2021-3481 actively exploited?

Active exploitation of CVE-2021-3481 has not been confirmed. Its EPSS score was 0.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3481?

CVE-2021-3481 has a CVSS v3 base score of 7.1 (HIGH severity).

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