What is the CVSS score of CVE-2025-63685?

CVE-2025-63685 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Quark Cloud Drive are affected by CVE-2025-63685?

Organizations using Quark Cloud Drive v3.23.2 face critical risk from CVE-2025-63685 rated CVSS 9.8.

Is there a public PoC exploit available for CVE-2025-63685?

Yes, a public proof-of-concept exploit is available for CVE-2025-63685. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-63685?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Monitor vendor channels for patch availability.

Quark Cloud Drive CVE-2025-63685

CRITICAL

Public cloneable() Method Without Final ('Object Hijack') (CWE-491)

2025-11-20 cve@mitre.org

Information Disclosure Quark Cloud Drive

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:23 vuln.today

PoC Detected

Dec 16, 2025 - 18:05 vuln.today

Public exploit code

CVE Published

Nov 20, 2025 - 21:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Quark Cloud Drive v3.23.2 has a DLL Hijacking vulnerability. This vulnerability stems from the insecure loading of system libraries. Specifically, the application does not validate the path or signature of [regsvr32.exe] it loads. An attacker can place a crafted malicious DLL in the application's startup directory, which will be loaded and executed when the user launches the program.

AnalysisAI

Quark Cloud Drive v3.23.2 has a DLL Hijacking vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-491. Quark Cloud Drive v3.23.2 has a DLL Hijacking vulnerability. This vulnerability stems from the insecure loading of system libraries. Specifically, the application does not validate the path or signature of [regsvr32.exe] it loads. An attacker can place a crafted malicious DLL in the application's startup directory, which will be loaded and executed when the user launches the program. Affected products include: Quark Quark Cloud Drive.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

CVE-2025-63685 vulnerability details – vuln.today

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Quark Cloud Drive CVE-2025-63685

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code