CVE-2019-18281

Name: CVE-2019-18281
Creator: NVD / NIST
Published: 2019-10-23T15:15:14.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 2.05%

Last modified Jun 17, 2026

CVE-2019-18281 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An out-of-bounds memory access in the generateDirectionalRuns() function in qtextengine.cpp in Qt qtbase 5.11.x and 5.12.x before 5.12.5 allows attackers to cause a denial of service by crashing an application via a text file containing many directional characters.. EPSS estimates a 2.05% chance of exploitation in the next 30 days.

Description

An out-of-bounds memory access in the generateDirectionalRuns() function in qtextengine.cpp in Qt qtbase 5.11.x and 5.12.x before 5.12.5 allows attackers to cause a denial of service by crashing an application via a text file containing many directional characters.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

2.05%

78.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Qt	Qtbase	>= 5.11.0, <= 5.11.3
Qt	Qtbase	>= 5.12.0, < 5.12.5
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

https://bugreports.qt.io/browse/QTBUG-77819Permissions Required
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1848784Issue Tracking, Third Party Advisory
https://codereview.qt-project.org/c/qt/qtbase/+/271889Patch, Vendor Advisory
https://seclists.org/bugtraq/2019/Nov/4Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-60
https://usn.ubuntu.com/4275-1/
https://www.debian.org/security/2019/dsa-4556Third Party Advisory
https://bugreports.qt.io/browse/QTBUG-77819Permissions Required
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1848784Issue Tracking, Third Party Advisory
https://codereview.qt-project.org/c/qt/qtbase/+/271889Patch, Vendor Advisory
https://seclists.org/bugtraq/2019/Nov/4Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-60
https://usn.ubuntu.com/4275-1/
https://www.debian.org/security/2019/dsa-4556Third Party Advisory

Timeline

Published: Oct 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18281?

How severe is CVE-2019-18281?

CVE-2019-18281 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 2.05% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18281?

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-2019-18281?

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

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Source: NVD / NIST