CVE-2021-20025

Name: CVE-2021-20025
Creator: NVD / NIST
Published: 2021-05-13T15:15:07.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-20025 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.36%

27.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sonicwall	Email Security Virtual Appliance	<= 10.0.9

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0012Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0012Vendor Advisory

Timeline

Published: May 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20025?

How severe is CVE-2021-20025?

CVE-2021-20025 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20025?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20025?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST