Vulnerability-Lookup

CVE-2025-6338 (GCVE-0-2025-6338)

Vulnerability from cvelistv5 – Published: 2025-10-16 09:22 – Updated: 2026-07-29 08:54

Title

Possible denial of service with multiple incoming connections to a Schannel based server with a TLS backend

Summary

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.

Severity

9.2 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-16 13:14 UTC

CWE

CWE-459 - Incomplete Cleanup

Assigner

TQtC Scorecard

References

1 reference

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

Impacted products

1 product

Vendor	Product	Version
Qt	Qt	Unaffected: 0 , < 5.15.0 (python) Affected: 5.15.0 , ≤ 6.8.3 (python) Unaffected: 6.8.4 , < 6.9.0 (python) Affected: 6.9.0 , < 6.9.2 (python) cpe:2.3:a:qt:qt:::windows:::::* cpe:2.3:a:qt:qt:::windows:::::*

Show details on NVD website

JSON

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EUVD-2026-342269

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:55

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

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  "date_reserved": "2026-10-02T07:55:14.383146+00:00",
  "id": "EUVD-2026-342269"
}

FKIE_CVE-2025-6338

Vulnerability from fkie_nvd - Published: 2025-10-16 10:15 - Updated: 2026-07-29 10:16

Severity

9.2 (Critical) - 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

Summary

References

	URL	Tags
	a59d8014-47c4-4630-ab43-e1b13cbe58e3	https://codereview.qt-project.org/c/qt/qtbase/+/651495

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-6338",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-10-16T13:14:05.730203Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-16T10:15:44.510",
  "references": [
    {
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/651495"
    }
  ],
  "sourceIdentifier": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-459"
        }
      ],
      "source": "a59d8014-47c4-4630-ab43-e1b13cbe58e3",
      "type": "Secondary"
    }
  ]
}

GHSA-M4HJ-JPXF-JHJP

Vulnerability from github – Published: 2025-10-16 12:30 – Updated: 2025-10-16 12:30

Details

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.

Severity

9.2 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-6338"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-459"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-16T10:15:44Z",
    "severity": "CRITICAL"
  },
  "details": "There is an incomplete cleanup vulnerability in Qt Network\u0027s 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.",
  "id": "GHSA-m4hj-jpxf-jhjp",
  "modified": "2025-10-16T12:30:23Z",
  "published": "2025-10-16T12:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6338"
    },
    {
      "type": "WEB",
      "url": "https://codereview.qt-project.org/c/qt/qtbase/+/651495"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

WID-SEC-W-2025-1422

Vulnerability from csaf_certbund - Published: 2025-06-29 22:00 - Updated: 2025-10-16 22:00

Summary

QT: Schwachstelle ermöglicht Denial of Service

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2025-6338.

CVE-2025-6338

Known affected: 3 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2025-6338 (GCVE-0-2025-6338)

EUVD-2026-342269

FKIE_CVE-2025-6338

GHSA-M4HJ-JPXF-JHJP

WID-SEC-W-2025-1422

Tags

Sightings

Nomenclature

Related by attack behaviour