How severe is CVE-2025-63685?

CVE-2025-63685 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-63685 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-63685?

CVE-2025-63685 affects Quark Quark Cloud Drive. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-63685?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-63685 have an EU (EUVD) identifier?

Yes. CVE-2025-63685 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198336.

When was CVE-2025-63685 published?

CVE-2025-63685 was published on 2025-11-20 and last updated on 2026-06-17.

CVE-2025-63685

CVE-2025-63685 is a critical-severity vulnerability in Quark Quark Cloud Drive with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-491.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198336
Weakness: CWE-491
Affected product: Quark Quark Cloud Drive
Published: 2025-11-20
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-63685?: CVE-2025-63685 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-63685 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-63685?: CVE-2025-63685 affects Quark Quark Cloud Drive. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-63685?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-63685 have an EU (EUVD) identifier?: Yes. CVE-2025-63685 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198336.
When was CVE-2025-63685 published?: CVE-2025-63685 was published on 2025-11-20 and last updated on 2026-06-17.

References

https://github.com/QIU-DIE/CVE/issues/5

Affected products (1)

cpe:2.3:a:quark:quark_cloud_drive:3.23.2:*:*:*:*:*:*:*

Other CWE-491 vulnerabilities

CVE-2025-60425 — High (CVSS 8.6): Nagios Fusion v2024R1.2 and v2024R2 does not invalidate already existing session tokens when the two-factor…
CVE-2024-39069 — High (CVSS 7.8): An issue in ifood Order Manager v3.35.5 'Gestor de Peddios.exe' allows attackers to execute arbitrary code via a DLL…
CVE-2025-55622 — Medium (CVSS 6.5): Reolink v4.54.0.4.20250526 was discovered to contain a task hijacking vulnerability due to inappropriate taskAffinity…

Browse all CWE-491 vulnerabilities →