CVE-2021-38593

Name: CVE-2021-38593
Creator: NVD / NIST
Published: 2021-08-12T02:15:06.58+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.06%

Last modified Jun 17, 2026

CVE-2021-38593 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 3.06% chance of exploitation in the next 30 days.

Description

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).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.06%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Qt	Qt	>= 5.0.0, < 5.15.6
Qt	Qt	>= 6.0.0, <= 6.1.2
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35566Issue Tracking, Patch, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qt/OSV-2021-903.yamlThird Party Advisory
https://github.com/qt/qtbase/commit/1ca02cf2879a5e1511a2f2109f0925cf4c892862Patch, Third Party Advisory
https://github.com/qt/qtbase/commit/202143ba41f6ac574f1858214ed8bf4a38b73ccdPatch, Third Party Advisory
https://github.com/qt/qtbase/commit/6b400e3147dcfd8cc3a393ace1bd118c93762e0cPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36VN2WKMNQUSTF6ZW2X52NPAJVXJ4S5I/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HY5YCSDCTLHVMP3OXOM6HNTWHV6DBHDX/
https://security.gentoo.org/glsa/202402-03
https://wiki.qt.io/Qt_5.15_Release#Known_IssuesIssue Tracking, Release Notes, Vendor Advisory
https://www.qt.io/blog/qt-5.15-extended-support-for-subscription-license-holdersRelease Notes
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35566Issue Tracking, Patch, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qt/OSV-2021-903.yamlThird Party Advisory
https://github.com/qt/qtbase/commit/1ca02cf2879a5e1511a2f2109f0925cf4c892862Patch, Third Party Advisory
https://github.com/qt/qtbase/commit/202143ba41f6ac574f1858214ed8bf4a38b73ccdPatch, Third Party Advisory
https://github.com/qt/qtbase/commit/6b400e3147dcfd8cc3a393ace1bd118c93762e0cPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36VN2WKMNQUSTF6ZW2X52NPAJVXJ4S5I/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HY5YCSDCTLHVMP3OXOM6HNTWHV6DBHDX/
https://security.gentoo.org/glsa/202402-03
https://wiki.qt.io/Qt_5.15_Release#Known_IssuesIssue Tracking, Release Notes, Vendor Advisory
https://www.qt.io/blog/qt-5.15-extended-support-for-subscription-license-holdersRelease Notes

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38593?

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).

How severe is CVE-2021-38593?

CVE-2021-38593 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.06% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38593?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38593?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST