CVE-2021-20039: SonicWall SMA 200 Firmware

High severity, CVSS 8.8. EPSS: 78.7% chance of exploitation in the next 30 days.

Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Affected products

• SonicWall SMA 200 Firmware: version 9.0.0.11-31sv only; version 10.2.0.8-37sv only; version 10.2.1.1-19sv only
• SonicWall SMA 210 Firmware: version 9.0.0.11-31sv only; version 10.2.0.8-37sv only; version 10.2.1.1-19sv only
• SonicWall SMA 400 Firmware: version 9.0.0.11-31sv only; version 10.2.0.8-37sv only; version 10.2.1.1-19sv only
• SonicWall SMA 410 Firmware: version 9.0.0.11-31sv only; version 10.2.0.8-37sv only; version 10.2.1.1-19sv only
• SonicWall SMA 500v Firmware: version 9.0.0.11-31sv only; version 10.2.0.8-37sv only; version 10.2.1.1-19sv only

Published 2021-12-08. Last modified 2026-06-17.