CVE-2025-52856
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-29

Last updated on: 2025-12-10

Assigner: QNAP Systems, Inc.

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
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Meta Information
Published
2025-08-29
Last Modified
2025-12-10
Generated
2026-06-16
AI Q&A
2025-08-29
EPSS Evaluated
2026-06-15
NVD
CVE-2025-52856
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
qnap qvr From 5.1.0 (inc) to 5.1.6 (exc)
qnap qvr 5.1.6
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
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Impact Analysis

This vulnerability can allow a remote attacker to gain unauthorized access to the VioStor system, potentially compromising system security and control. This could lead to unauthorized actions or data exposure on the affected device. [1]

Executive Summary

CVE-2025-52856 is an improper authentication vulnerability in the QVR firmware for legacy VioStor NVR devices. It allows a remote attacker to bypass authentication controls and compromise the security of the system without needing valid credentials. [1]

Mitigation Strategies

To mitigate this vulnerability, immediately update your VioStor NVR firmware to version 5.1.6 build 20250621 or later. The update process involves logging into the VioStor NVR as an administrator, navigating to Control Panel > System Settings > Firmware Update, uploading the latest firmware file downloaded from the official QNAP website, and applying the update. Regularly updating firmware is recommended to maintain device security and protect against known vulnerabilities. [1]

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