CVE-2021-20021
SonicWall Email Security Improper Privilege Management Vulnerability
- Published
- Apr 9, 2021
- Updated
- Aug 12, 2026
- Assigning CNA
- sonicwall
- Evidence observed
- Nov 3, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.8%
- Model date
- Oct 18, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
http/cves/2021/CVE-2021-20021.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: dsl($.matchers[*].type)
Proof-of-concept exploit for CVE-2021-20021, demonstrating the vulnerability and potential impact for security research and testing.
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