---
cve: "CVE-2025-6338"
severity: "CRITICAL"
cvss: 9.2
epss: "0.4%"
vendor: "Qt"
kev: false
exploited: false
published: "2025-10-16 09:22:14"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T23:14:22+02:00"
---

# CVE-2025-6338

> 9.2 CRITICAL

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-6338) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_