Qt up to 6.8.3/6.9.1 on Windows cleanup

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Qt up to 6.8.3/6.9.1 on Windows. This impacts an unknown function. The manipulation results in cleanup. This vulnerability was named CVE-2025-6338. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Qt up to 6.8.3/6.9.1 on Windows. Affected is an unknown code block. The manipulation with an unknown input leads to a cleanup vulnerability. CWE is classifying the issue as CWE-459. The product does not properly "clean up" and remove temporary or supporting resources after they have been used. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at codereview.qt-project.org. This vulnerability is traded as CVE-2025-6338 since 06/19/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 6.9.0 or 6.9.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-34743). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cleanup
CWE: CWE-459
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Qt 6.9.0/6.9.2

Timelineinfo

06/19/2025 CVE reserved
10/16/2025 +119 days Advisory disclosed
10/16/2025 +0 days VulDB entry created
10/16/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: codereview.qt-project.org
Status: Confirmed

CVE: CVE-2025-6338 (🔒)
GCVE (CVE): GCVE-0-2025-6338
GCVE (VulDB): GCVE-100-328788
EUVD: 🔒

Entryinfo

Created: 10/16/2025 12:01
Updated: 10/16/2025 12:22
Changes: 10/16/2025 12:01 (65), 10/16/2025 12:22 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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