QNAP NetBak Replicator Vulnerability Let Attackers Execute Unauthorized Code

QNAP has released a security advisory detailing a vulnerability in its NetBak Replicator utility that could allow local attackers to execute unauthorized code.

The flaw, identified as CVE-2025-57714, has been rated as “Important” and affects specific versions of the backup and restore software. The company has already issued a patch and is urging users to update their systems to prevent potential exploitation.

This vulnerability stems from an unquoted search path or element within the NetBak Replicator software. This type of flaw occurs when the path to an executable file is not properly enclosed in quotation marks.

If a local attacker has already gained access to a user account on the system, they can place a malicious executable in a parent directory of the legitimate program’s path.

The operating system may then inadvertently execute the malicious file instead of the intended one, leading to unauthorized code execution with the permissions of the running application.

Affected Products

The vulnerability specifically impacts NetBak Replicator versions 4.5.x. According to the advisory released on October 4, 2025, a successful exploit requires an attacker to have prior access to a local user account.

From there, they can leverage the unquoted search path to execute arbitrary commands or code. This could allow the attacker to escalate privileges, install persistent malware, or manipulate data on the compromised system.

While the attack requires local access, it represents a significant risk in multi-user environments or as a post-exploitation technique for privilege escalation.

CVE ID	Affected Product(s)	Impact	Prerequisites	CVSS 3.1 Score
CVE-2025-57714	NetBak Replicator 4.5.x	Unauthorized code execution	Local attacker with user account access	Not Publicly Disclosed

Mitigations

QNAP has addressed the security flaw in NetBak Replicator version 4.5.15.0807 and all subsequent releases.

The company strongly recommends that all users of the affected software versions update to the latest patched version immediately to protect their devices from potential attacks.

Users can find the latest software updates by visiting the official QNAP Utilities webpage. Regularly updating software is a critical security practice that ensures systems are protected against newly discovered vulnerabilities and threats. The discovery of this vulnerability was credited to Kazuma Matsumoto of GMO Cybersecurity by IERAE, Inc.

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