CVE-2020-36937 in MEMU PLAY
Summary
by MITRE • 01/25/2026
Microvirt MEMU Play 3.7.0 contains an unquoted service path vulnerability in the MEmusvc Windows service that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted binary path to inject malicious executables that will be run with elevated LocalSystem privileges.
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Analysis
by VulDB Data Team • 01/26/2026
The vulnerability identified as CVE-2020-36937 affects Microvirt MEMU Play version 3.7.0 and represents a critical security flaw in the Windows service architecture. This issue manifests through an unquoted service path configuration that creates a privilege escalation vector for local attackers. The vulnerability specifically impacts the MEmusvc Windows service which is part of the MEMU Play virtualization environment designed for Android application testing and emulation. The service operates with elevated LocalSystem privileges, making it a prime target for malicious exploitation.
The technical flaw stems from improper service path configuration where the executable path for MEmusvc is not enclosed in quotation marks. This configuration allows Windows to interpret the path components separately, creating opportunities for path traversal attacks. When Windows attempts to resolve the service binary path, it searches through directory structures in a predictable manner, potentially allowing an attacker to place a malicious executable in a parent directory that Windows will execute instead of the legitimate service binary. This behavior aligns with CWE-428, which describes weaknesses related to the improper handling of unquoted service paths.
The operational impact of this vulnerability is significant as it enables local privilege escalation attacks that can result in complete system compromise. Attackers exploiting this vulnerability can execute arbitrary code with the highest available privileges, effectively bypassing standard user access controls and system defenses. The attack vector is particularly concerning because it requires minimal privileges to exploit, as the service already runs with LocalSystem rights. This means that any local user, including unprivileged accounts, can potentially leverage this flaw to gain administrative control over the system. The vulnerability creates a persistent backdoor that can be used for ongoing system compromise.
Mitigation strategies for CVE-2020-36937 should focus on immediate service path remediation and comprehensive system hardening. The primary fix involves modifying the service binary path to ensure it is properly quoted, preventing Windows from interpreting the path components separately. Security professionals should also implement the principle of least privilege by reviewing and restricting service permissions where possible. System administrators should conduct thorough vulnerability assessments to identify other services with similar unquoted path configurations. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically noting that unquoted service paths represent a common method for maintaining persistence and elevating privileges. Organizations should also consider implementing application whitelisting policies and monitoring for suspicious service execution patterns to detect potential exploitation attempts. Regular security updates and patch management processes are essential to prevent similar vulnerabilities from being introduced through service installations.