Vulnerability Report

CVE-2021-20021

CISA KEV Active

Title: Sonicwall Email Security Appliance 5000 Auth Bypass

Auth Bypass

Proof Of Concept

PoC Available for CVE-2021-20021

CWE Category CWE-269
Published Date Apr 09, 2021
Modified Date Nov 10, 2025
Exploit Status Available
Score 9.8 CVSS v3.1
Exploit Probability (EPSS)
83.42%

Vulnerability Summary

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.

Impacted Vendors

W
websense 1
C
cisco 1
S
sonicwall 11

Reference Links

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007 https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v3.1
Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0
Severity CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity HIGH
7.5
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-20021 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/SUPRAAA-1337/CVE-2021-20021
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.