CVE-2019-18281
CVE-2019-18281 is a medium-severity vulnerability in Qt Qtbase with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: Medium (CVSS 3.x base score 4.3)
- CVSS v2: 4.3
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Qt Qtbase
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2019-18281?
- 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.
- How severe is CVE-2019-18281?
- CVE-2019-18281 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2019-18281 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-18281?
- CVE-2019-18281 primarily affects Qt Qtbase. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-18281?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-18281 published?
- CVE-2019-18281 was published on 2019-10-23 and last updated on 2026-06-17.
References
- https://bugreports.qt.io/browse/QTBUG-77819
- https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1848784
- https://codereview.qt-project.org/c/qt/qtbase/+/271889
- https://seclists.org/bugtraq/2019/Nov/4
- https://security.gentoo.org/glsa/202003-60
- https://usn.ubuntu.com/4275-1/
- https://www.debian.org/security/2019/dsa-4556
Affected products (3)
- cpe:2.3:a:qt:qtbase:*:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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- CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.