CVE-2021-20021

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.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007	Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:sonicwall:email_security::::::::
	cpe:2.3:a:sonicwall:hosted_email_security::::::::

History

22 Oct 2025, 00:17

Type	Values Removed	Values Added
References		() https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021 -

21 Oct 2025, 20:18

Type	Values Removed	Values Added
References	~~{'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021', 'source': '134c704f-9b21-4f2e-91b3-4a467353bcc0'}~~

21 Oct 2025, 19:18

Type	Values Removed	Values Added
References		() https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021 -

21 Nov 2024, 05:45

Type	Values Removed	Values Added
References	~~() https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007 - Vendor Advisory~~	() https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007 - Vendor Advisory

Information

Published : 2021-04-09 18:15

Updated : 2025-10-22 00:17

NVD link : CVE-2021-20021

Mitre link : CVE-2021-20021

CVE.ORG link : CVE-2021-20021

JSON object : View

Products Affected

sonicwall

email_security
hosted_email_security

CWE

CWE-269

Improper Privilege Management

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