# CVE-2025-6338

## Summary

- **CVE ID:** CVE-2025-6338
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (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)
- **CWE:** CWE-459
- **Published:** Oct 16, 2025
- **Last Modified:** Jul 29, 2026

## 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.

## Affected Products

- The Qt Company — Qt (0)
- The Qt Company — Qt (5.15.0)
- The Qt Company — Qt (6.8.4)
- The Qt Company — Qt (6.9.0)
- Qt — Qt (0)
- Qt — Qt (5.15.0)
- Qt — Qt (6.8.4)
- Qt — Qt (6.9.0)

## References

- [CNA](https://codereview.qt-project.org/c/qt/qtbase/+/651495)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 32.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._