by Kastro
Paper/Archive/CVE-2025-6338

CVE-2025-6338

Qt Qt — Possible denial of service with multiple incoming connections to a Schannel based server with a TLS backend

EPSS 0.4%CVSS 9.2
critical.is priorityof 100
35
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 37.0.370 × 207.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

There is an incomplete cleanup vulnerability in Qt Network's Schannel support on Windows which can lead to a Denial of Service over a long period. This issue affects Qt from 5.15.0 through 6.8.3, from 6.9.0 before 6.9.2.

Affected

ProductAffectedFixed inSource
Qt5.15.0 – 6.8.3–CNA
Qt6.9.0 – < 6.9.26.9.2CNA

Scores by source

TQtC (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refcodereview.qt-project.org/c/qt/qtbase/+/651495