What is CVE-2025-63685?

CVE-2025-63685 is a critical-severity vulnerability in Quark Cloud Drive, classified under CWE-491. CVSS score: 9.8/10. Published 2025-11-20.

How severe is CVE-2025-63685?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Quark Cloud Drive

CVE-2025-63685

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.

EPSS: 0.004 (28.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Quark Quark_cloud_drive — versions 3.23.2
N/a — versions n/a

Weakness classification (CWE)

CWE-491

References

cve@mitre.org (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2025-63685?: CVE-2025-63685 is a critical-severity vulnerability in Quark Cloud Drive, classified under CWE-491. CVSS score: 9.8/10. Published 2025-11-20.
How severe is CVE-2025-63685?: Critical severity. CVSS v3 base score is 9.8 out of 10.