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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-20025
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0012