CVE-2025-52856
criticalAn improper authentication vulnerability has been reported to affect VioStor.
Vendor / product: Qnap — qvr
An improper authentication vulnerability has been reported to affect VioStor. If a remote attacker, they can then exploit the vulnerability to compromise the security of the system. We have already fixed the vulnerability in the following version: VioStor 5.1.6 build 20250621 and later
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-08-29 18:15
Modified: 2026-10-18 21:10
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
qnap / qvr ≥5.1.0 <5.1.6, 5.1.6
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.qnap.com/en/security-advisory/qsa-25-29
References
- https://www.qnap.com/en/security-advisory/qsa-25-29 security@qnapsecurity.com.tw
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗