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.
Published: 2025-10-16
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

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History

Tue, 21 Oct 2025 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Qt
Qt qt
Vendors & Products Microsoft
Microsoft windows
Qt
Qt qt

Thu, 16 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 16 Oct 2025 09:45:00 +0000

Type Values Removed Values Added
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.
Title Possible denial of service with multiple incoming connections to a Schannel based server with a TLS backend
Weaknesses CWE-459
References
Metrics cvssV4_0

{'score': 9.2, 'vector': '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'}

Subscriptions

Microsoft Windows
Qt Qt
cve-icon MITRE

Status: PUBLISHED

Assigner: TQtC

Published:

Updated: 2025-10-16T13:14:11.939Z

Reserved: 2025-06-19T10:25:01.875Z

Link: CVE-2025-6338

cve-icon Vulnrichment

Updated: 2025-10-16T13:14:08.583Z

cve-icon NVD

Status : Deferred

Published: 2025-10-16T10:15:44.510

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-6338

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-10-21T09:40:06Z

Weaknesses