CVE-2025-6338

CRITICAL EPSS 32.1%

Published Oct 16, 20258mo ago · Modified Jun 17, 20262w ago

9.2 CVSS 4.0

Critical

Published Oct 16, 2025 8mo ago

Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score

9.2

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

32.1% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-459

References 1

codereview.qt-project.org https://codereview.qt-project.org/c/qt/qtbase/+/651495

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.