Known Exploited Vulnerabilities CVE-2021-20035

SonicWall SMA100 appliances contain an OS command injection vulnerability in the management interface that allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user, which could potentially lead to code execution.

Mappings

Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name Notes
CVE-2021-20035 SonicWall SMA100 Appliances OS Command Injection Vulnerability exploitation_technique T1078 Valid Accounts
Comments
While this vulnerability was originally considered a denial-of-service issue in 2021, this improper neutralization issue has been exploited in 2025 as a remote code execution vulnerability. After authenticating (either with default credentials or via brute force, password stuffing, or dictionary attacks), an attacker can execute arbitrary commands as a "nobody" user.
References
CVE-2021-20035 SonicWall SMA100 Appliances OS Command Injection Vulnerability exploitation_technique T1059 Command and Scripting Interpreter
Comments
While this vulnerability was originally considered a denial-of-service issue in 2021, this improper neutralization issue has been exploited in 2025 as a remote code execution vulnerability. After authenticating (either with default credentials or via brute force, password stuffing, or dictionary attacks), an attacker can execute arbitrary commands as a "nobody" user.
References