CVE-2021-20038

CVE-2021-20038

Vendor Sonicwall
Product SonicWall SMA100
Weakness CWE-121
KEV Status Known Exploited
Ransomware Used in campaigns
Published December 8, 2021
Last update October 21, 2025

CVSS base score

What the vulnerability does

01Description

A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

December 8, 2021 CVE published
October 21, 2025 Record updated