SB2025090235 - Multiple vulnerabilities in QNAP QVR Firmware for Legacy VioStor NVR

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper Authentication (CVE-ID: CVE-2025-52856)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests. A remote attacker can bypass authentication process and gain unauthorized access to the application.

Note: The vulnerability affects the QVR firmware for legacy VioStor NVR.

2) Path traversal (CVE-ID: CVE-2025-52861)

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote administrator can send a specially crafted HTTP request and read arbitrary files on the system.

Note: The vulnerability affects the QVR firmware for legacy VioStor NVR.

Remediation

Install update from vendor's website.

References

• https://www.qnap.com/en/security-advisory/qsa-25-29
• https://www.qnap.com/en/security-advisory/qsa-25-28