CVE-2021-20040: SonicWall SMA 200 Firmware

High severity, CVSS 7.5. EPSS: 25.2% chance of exploitation in the next 30 days.

A relative path traversal vulnerability in the SMA100 upload funtion allows a remote unauthenticated attacker to upload crafted web pages or files as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Affected products

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

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