Is CVE-2021-38593 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 3%.

What products does CVE-2021-38593 affect?

Tracked products affected include Qt, Fedora. Check the version you run to see whether it is affected.

How do I fix CVE-2021-38593?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2021-38593

Q: What is CVE-2021-38593?

CVE-2021-38593 is a high-severity software vulnerability (Out-of-bounds write) with a CVSS score of 7.5. 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).

HIGH severity · CVSS 7.5 · Out-of-bounds write

7.5CVSS HIGH

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).

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)3%

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

Affected products we track (2)

Qt Fedora

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35566 ↗

Additional information

NVD record
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35566Patch
https://github.com/qt/qtbase/commit/1ca02cf2879a5e1511a2f2109f0925cf4c892862Patch
https://github.com/qt/qtbase/commit/202143ba41f6ac574f1858214ed8bf4a38b73ccdPatch
https://github.com/qt/qtbase/commit/6b400e3147dcfd8cc3a393ace1bd118c93762e0cPatch
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qt/OSV-2021-903.yamlAdvisory
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