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Fencer Vulns
high 7.1

CVE-2021-3481 json

A flaw was found in Qt.

published 2022-08-22 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26803

cvss
7.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • qtsvg-opensource-src Debian 14, Debian 13, Debian 12 5.15.2-3

debian advisories DEBIAN-CVE-2021-3481

  • qtsvg-opensource-src Ubuntu 18.04 LTS 5.9.5-0ubuntu1.1
  • qtsvg-opensource-src Ubuntu Pro 16.04 LTS 5.5.1-2ubuntu0.1~esm1
  • qtsvg-opensource-src Ubuntu Pro 20.04 LTS 5.12.8-0ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2021-3481

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qt5 RHEL 8 5.15.2-1.el8
  • sip RHEL 8 4.19.24-2.el8
  • qt5-qt3d RHEL 8 5.15.2-2.el8
  • qt5-qtdoc RHEL 8 5.15.2-1.el8
  • qt5-qtsvg RHEL 8 5.15.2-3.el8
  • adwaita-qt RHEL 8 1.2.1-3.el8
  • python-qt5 RHEL 8 5.15.0-2.el8
  • qt5-qtbase RHEL 8 5.15.2-3.el8

red hat advisories RHSA-2021:4172

  • libqt4 SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 4.8.7-8.16.1
  • libqt4-sql-plugins SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 4.8.7-8.16.1
  • libqt5-qtsvg SLE Module for Desktop Applications 15 SP3, SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP3 +1 more 5.12.7-3.3.1
  • libqt5-qtsvg SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 5.6.2-3.6.1

suse advisories SUSE-SU-2021:4155-1SUSE-SU-2021:3354-1SUSE-SU-2021:3333-1

  • libqt5-qtsvg openSUSE Leap 15.2 5.12.7-lp152.2.3.1
  • libqt5-qtsvg openSUSE Leap 15.3 5.12.7-3.3.1

opensuse advisories openSUSE-SU-2021:1371-1openSUSE-SU-2021:3354-1

  • sip AlmaLinux 8 4.19.24-2.el8
  • qt5-qt3d AlmaLinux 8 5.15.2-2.el8
  • qt5-qtdoc AlmaLinux 8 5.15.2-1.el8
  • qt5-qtsvg AlmaLinux 8 5.15.2-3.el8
  • qt5-qtbase AlmaLinux 8 5.15.2-3.el8
  • adwaita-qt5 AlmaLinux 8 1.2.1-3.el8
  • python3-qt5 AlmaLinux 8 5.15.0-2.el8
  • qt5-qttools AlmaLinux 8 5.15.2-3.el8

almalinux advisories ALSA-2021:4172

  • sip Rocky Linux 8 4.19.24-2.el8
  • adwaita-qt Rocky Linux 8 1.2.1-3.el8
  • python-qt5 Rocky Linux 8 5.15.0-2.el8
  • qgnomeplatform Rocky Linux 8 0.7.1-2.el8

rocky linux advisories RLSA-2021:4172

  • qt6-svg Arch Linux 6.0.3-1
  • qt5-svg Arch Linux 5.15.2-2

arch linux advisories AVG-1768AVG-1769

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3481 updated cvss 7.1

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

  • Red Hat Enterprise Linux 6 qt, qt3, qt-x11, qt-odbc, qt-demos, qt-mysql, +10 more Red Hat Enterprise Linux 7 qt, qt3, qt-x11, qt-odbc, qt-qvfb, qt-demos, +12 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) sip 4.19.24-2.el8 Red Hat Enterprise Linux AppStream (v. 8) qt5 5.15.2-1.el8, sip 4.19.24-2.el8, qt5-qt3d 5.15.2-2.el8, adwaita-qt 1.2.1-3.el8, qt5-qtdoc 5.15.2-1.el8, qt5-qtsvg 5.15.2-3.el8, +65 more
    fixed: vendor fix RHSA-2021:4172
  • Red Hat Enterprise Linux 9 qt5-qtbase, qt5-qtbase-gui, qt5-qtbase-odbc, qt5-qtbase-mysql, qt5-qtbase-common, qt5-qtbase-examples, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugreports.qt.io https://bugreports.qt.io/browse/QTBUG-91507 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Affected products

  • n/a qt

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.