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CVE-2025-52856

QNAP Qvr authentication bypass

9.8 CRITICALEPSS 0.63%
  1. Published29 Aug 2025

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

QNAP Qvr≥ 5.1.0 < 5.1.6 · 5.1.6

Remediation

Fixed in
QNAP Qvr≥ 5.1.6

References

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Frequently asked

Is CVE-2025-52856 being actively exploited?

CVE-2025-52856 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.63%.

How severe is CVE-2025-52856?

CVE-2025-52856 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2025-52856?

Affected products include QNAP Qvr.

How do I fix CVE-2025-52856?

Upgrade affected software to a fixed version, for example QNAP Qvr 5.1.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-52856 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.