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Fencer Vulns
high 7.5

CVE-2021-38593 json

Qt 5.x before 5.15.6 and 6.x through 6.1.2 has an out-of-bounds write in QOutlineMapper::convertPath (called from QRasterPaintEngine::fill…

published 2021-08-12 5 y ago modified 2026-11-02 6 d ago also EUVD-2021-25035

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

Qt 5.x before 5.15.6 and 6.x through 6.1.2 has an out-of-bounds write in QOutlineMapper::convertPath (called from QRasterPaintEngine::fill and QPaintEngineEx::stroke).

Patch / fix

  • qt qt 5.15.6
  • qtbase-opensource-src Ubuntu 18.04 LTS 5.9.5+dfsg-0ubuntu2.6
  • qtbase-opensource-src Ubuntu 20.04 LTS 5.12.8+dfsg-0ubuntu2.1

ubuntu advisories UBUNTU-CVE-2021-38593

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-qtbase RHEL 8 5.15.2-4.el8
  • qt5-qtbase-gui RHEL 8 5.15.2-4.el8
  • qt5-qtbase-odbc RHEL 8 5.15.2-4.el8
  • qt5-qtbase-mysql RHEL 8 5.15.2-4.el8
  • qt5-qtbase-common RHEL 8 5.15.2-4.el8
  • qt5-qtbase-examples RHEL 8 5.15.2-4.el8
  • qt5-qtbase-postgresql RHEL 8 5.15.2-4.el8

red hat advisories RHSA-2022:1796

  • qt5-qtbase AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-gui AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-odbc AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-mysql AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-common AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-examples AlmaLinux 8 5.15.2-4.el8
  • qt5-qtbase-postgresql AlmaLinux 8 5.15.2-4.el8

almalinux advisories ALSA-2022:1796

  • qt5-qtbase Rocky Linux 8 5.15.2-4.el8

rocky linux advisories RLSA-2022:1796

  • qt5-qtbase CBL-Mariner 2.0 5.12.11-11
  • qt5-qtsvg CBL-Mariner 2.0 5.12.11-3

azure linux advisories AZL-34211AZL-6838

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • qt6-base Arch Linux 6.1.3-1
  • qt5-base Arch Linux 5.15.2+kde+r222-1

arch linux advisories AVG-2281AVG-2282

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-2021-38593 updated cvss 7.5

qt: out-of-bounds write in QOutlineMapper::convertPath called from QRasterPaintEngine::fill and QPaintEngineEx::stroke

  • Red Hat Enterprise Linux 6 qt, qt-x11, qt-odbc, qt-demos, qt-mysql, qt-sqlite, +3 more Red Hat Enterprise Linux 7 qt, qt-x11, qt-odbc, qt-qvfb, qt-demos, qt-mysql, +14 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 qt5, qt5-rpm-macros, qt5-srpm-macros Red Hat Enterprise Linux 9 qt5, qt5-rpm-macros, qt5-srpm-macros
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) qt5-qtbase 5.15.2-4.el8, qt5-qtbase-gui 5.15.2-4.el8, qt5-qtbase-odbc 5.15.2-4.el8, qt5-qtbase-mysql 5.15.2-4.el8, qt5-qtbase-common 5.15.2-4.el8, qt5-qtbase-examples 5.15.2-4.el8, +1 more Red Hat Enterprise Linux CRB (v. 8) qt5-qtbase-static 5.15.2-4.el8, qt5-qtbase-debuginfo 5.15.2-4.el8, qt5-qtbase-debugsource 5.15.2-4.el8, qt5-qtbase-gui-debuginfo 5.15.2-4.el8, qt5-qtbase-odbc-debuginfo 5.15.2-4.el8, qt5-qtbase-devel-debuginfo 5.15.2-4.el8, +4 more
    fixed: vendor fix RHSA-2022:1796
  • Red Hat Enterprise Linux 6 qt3, qt3-ODBC, qt3-MySQL, qt3-config, qt3-sqlite, qt3-designer, +1 more Red Hat Enterprise Linux 7 qt3, qt3-ODBC, qt3-MySQL, qt3-config, qt3-designer, qt3-PostgreSQL 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 d ago

Exploit prediction

3.00% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

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.