CVE-2023-33285

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-22 · updated 2026-06-17
Weakness: CWE-125

Description

An issue was discovered in Qt 5.x before 5.15.14, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. QDnsLookup has a buffer over-read via a crafted reply from a DNS server.

Affected products

Qt: from 5.0.0 before 5.15.4; from 6.0.0 before 6.2.9; from 6.3.0 before 6.5.1 — fixed in 5.15.4, 6.2.9, 6.5.1

How to fix

Upgrade to a fixed version: Qt 5.15.4, 6.2.9, 6.5.1. Check the vendor advisory for mitigations.

References

https://codereview.qt-project.org/c/qt/qtbase/+/477644
https://lists.debian.org/debian-lts-announce/2024/04/msg00027.html
https://codereview.qt-project.org/c/qt/qtbase/+/477644
https://lists.debian.org/debian-lts-announce/2024/04/msg00027.html

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