CVE-2019-18281

18

FAUCET Score

CVE-2019-18281 is an out-of-bounds memory access vulnerability in the generateDirectionalRuns() function of Qt qtbase versions 5.11.x and 5.12.x before 5.12.5, affecting Debian and Qt products. This medium-severity vulnerability (CVSS 4.3) can be triggered remotely with low complexity by an unauthenticated attacker, requiring user interaction to crash an application via a specially crafted text file, leading to a denial of service. There is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 5.11.0, <= 5.11.3CPE matchmatch criteria	cpe:2.3:a:qt:qtbase::::::::
		>= 5.12.0, < 5.12.5CPE matchmatch criteria	cpe:2.3:a:qt:qtbase::::::::
		9.0CPE matchmatch criteria	cpe:2.3:o:debian:debian_linux:9.0:::::::*
		10.0CPE matchmatch criteria	cpe:2.3:o:debian:debian_linux:10.0:::::::*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

Exploitability Score

2.8

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

2.05%

Probability of exploitation in next 30 days

EPSS Percentile

79.2%

Percentile rank of EPSS score among Peer Group

As of 2026-07-24

Model: v2026.06.15

This CVE's current EPSS score of 0.0205 is in the 90th percentile among its peer group of 26,208 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (28)

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: python-qt5-0:5.13.1-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qgnomeplatform-0:0.4-3.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-0:5.12.5-3.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qt3d-0:5.12.5-2.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtbase-0:5.12.5-4.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtcanvas3d-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtconnectivity-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtdeclarative-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtdoc-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtgraphicaleffects-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtimageformats-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtlocation-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtmultimedia-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtquickcontrols-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtquickcontrols2-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtscript-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtsensors-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtserialbus-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtserialport-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtsvg-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qttools-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qttranslations-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtwayland-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtwebchannel-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtwebsockets-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtx11extras-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: qt5-qtxmlpatterns-0:5.12.5-1.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: sip-0:4.19.19-1.el8

Vendor Advisories (1)

redhatCVE-2019-18281Low

qt5-qtbase: Out-of-bounds access in generateDirectionalRuns() function in qtextengine.cpp

References

bugreports.qt.io / browse/QTBUG-77819

Permissions Required

bugs.launchpad.net / ubuntu/+source/qtbase-opensource-src/+bug/1848784

Issue TrackingThird Party Advisory

codereview.qt-project.org / c/qt/qtbase/+/271889

PatchVendor Advisory

seclists.org / bugtraq/2019/Nov/4

Mailing ListThird Party Advisory

security.gentoo.org / glsa/202003-60

usn.ubuntu.com / 4275-1

debian.org / security/2019/dsa-4556

Third Party Advisory