CVE-2021-20025: SonicWall Email Security Virtual Appliance

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

SonicWall Email Security Virtual Appliance version 10.0.9 and earlier versions contain a default username and a password that is used at initial setup. An attacker could exploit this transitional/temporary user account from the trusted domain to access the Virtual Appliance remotely only when the device is freshly installed and not connected to Mysonicwall.

Affected products

• SonicWall Email Security Virtual Appliance: up to and including 10.0.9

Published 2021-05-13. Last modified 2026-06-17.