CVE WatchAug 12, 2026

CVE-2021-20021

SonicWall Email Security Improper Privilege Management Vulnerability

CVSS

9.8

Critical

EPSS

83.4%

p100

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: Apr 9, 2021 · Last modified: Aug 12, 2026 · CWE-269

EPSS · 30d

83.4%EPSS · 30 days83.4%

2026-08-022026-08-31

KEV catalog record

Product

SonicWall / SonicWall Email Security

Vulnerability

SonicWall Email Security Improper Privilege Management Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

Nov 17, 2021

Known ransomware use

Yes

Summary description

SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-20021

Technical description

A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.

Official references

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