: It may fail to rotate log files larger than 4GB, which can be used to fill up disk space on a target machine. How to Stay Secure
The NSSM 2.24 vulnerability, also known as CVE-2021-3317, is a privilege escalation vulnerability. This vulnerability arises from a flawed design in the NSSM service, which allows a low-privileged user to exploit the service and gain elevated privileges.
While not classified as security vulnerabilities in the traditional sense, several documented bugs in NSSM version 2.24 create conditions that could be exploited by determined attackers: nssm-2.24 exploit
The most significant vulnerability explicitly tied to NSSM is , a high‑severity privilege escalation flaw discovered in 2025.
NSSM is a free, open-source service manager for Windows. It was designed to provide a more robust and feature-rich alternative to the built-in Windows Service Manager. NSSM allows users to easily install, configure, and manage services on a Windows system. Its features include support for services that don't daemonize, configurable service dependencies, and automatic service restarting. : It may fail to rotate log files
Recent security advisories, such as (published August 2025), highlight how improper permissions on nssm.exe can allow low-privileged local attackers to gain full administrative access. Why NSSM 2.24 is Targeted
Before examining specific code-level exploits, it is critical to understand how NSSM itself is weaponized by threat actors. Unlike traditional vulnerabilities that require patching, NSSM as a legitimate administrative tool is repurposed by attackers to establish persistence, escalate privileges, and maintain access to compromised systems. While not classified as security vulnerabilities in the
The NSSM-2.24 exploit affects any system that has the NSSM-2.24 software installed. This includes:
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