CVE-2021-20021

9.8 CRITICAL CISA KEV - Actively Exploited

Published: April 09, 2021 Modified: November 10, 2025

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007

Source: PSIRT@sonicwall.com

Vendor Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

90.2%

100th percentile

Exploitation Status

Actively Exploited

Remediation due: 2021-11-17

Weaknesses (CWE)

CWE-269 CWE-269

Affected Vendors

microsoft sonicwall

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