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CVE-2021-20021

🔥 Known Exploited (CISA KEV)CRITICAL
9.8
CVSS Severity Score
EPSS Score48.8280%
EPSS Percentile86.73th
Published2021-04-09
Last Modified2025-11-10
Data SourcesNVDCISA KEVFIRST.org EPSS

Vulnerability 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.

Affected Platforms (CPE)

📦
Sonicwall

Email Security

< 10.0.9.6103
💻
Sonicwall

Email Security Appliance 9000 Firmware

< 10.0.9.6105
💻
Sonicwall

Email Security Appliance 3300 Firmware

< 10.0.9.6105
💻
Sonicwall

Email Security Appliance 4300 Firmware

< 10.0.9.6105

References & Advisories

🔗 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

Related Security Intelligence Articles

Daily Global Cyber Threat Intelligence Digest — July 23, 2026

Key threat updates including CISA's KEV addition of Langflow CVE-2026-0770 remote code execution, unauthenticated path traversal in Windmill CVE-2026-29059, and ongoing incident response guidance for SonicWall SMA1000 zero-day exposures.

2026-07-23

Daily Global Cyber Threat Intelligence Digest — July 20, 2026

Technical analysis of zero-day exploit chains against SonicWall SMA1000 appliances (UTA0533), NGINX regular expression heap corruption vulnerabilities (CVE-2026-42533), and Sandworm's (UAC-0145) ClickFix fake CAPTCHA campaigns.

2026-07-20

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