CVE-2025-52856

VioStor

Published Aug 29, 2025 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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

Remediation

Vendor Solution

We have already fixed the vulnerability in the following version: VioStor 5.1.6 build 20250621 and later

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-26252 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
History
Type Values Removed Values Added
First Time appeared Qnap
Qnap qvr
CPEs cpe:2.3:a:qnap:qvr:*:*:*:*:*:*:*:*
cpe:2.3:a:qnap:qvr:5.1.6:-:*:*:*:*:*:*
Vendors & Products Qnap
Qnap qvr
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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
Title VioStor
Weaknesses CWE-287
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
qnap
Published
Updated
Feb 26, 2026, 5:47 PM
Reserved
Jun 20, 2025, 5:51 AM
Status
Analyzed
Published
Aug 29, 2025, 6:15 PM
Modified
Oct 18, 2026, 9:10 PM