Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

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.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 20 products from sonicwall, from microsoft, from sonicwall and 17 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-04-09T18:15:13.380

Last Modified

2025-11-10T19:04:58.607

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

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

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

10.0

Impact Score

6.4

Weaknesses
  • Type: Secondary
    CWE-269
  • Type: Primary
    CWE-269
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application sonicwall email_security < 10.0.9.6103 Yes
Operating System microsoft windows - No
Operating System sonicwall email_security_appliance_9000_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_9000 - No
Operating System sonicwall email_security_appliance_3300_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_3300 - No
Operating System sonicwall email_security_appliance_4300_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_4300 - No
Operating System sonicwall email_security_appliance_8300_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_8300 - No
Operating System sonicwall email_security_appliance_5000_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_5000 - No
Operating System sonicwall email_security_appliance_7000_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_7000 - No
Operating System sonicwall email_security_appliance_5050_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_5050 - No
Operating System sonicwall email_security_appliance_7050_firmware < 10.0.9.6105 Yes
Hardware sonicwall email_security_appliance_7050 - No
Application sonicwall email_security_virtual_appliance < 10.0.9.6105 Yes
Application sonicwall hosted_email_security < 10.0.9.6103 Yes
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For sonicwall's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.