# CVE-2021-20021: SonicWall Email Security Improper Privilege Management Vulnerability

> CVE-2021-20021: SonicWall Email Security Improper Privilege Management Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-20021
Last updated: 2026-08-12T03:55:25Z

- Published: 2021-04-09 17:50 UTC · Updated: 2026-08-12 03:55 UTC · Assigner: sonicwall
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 88.8%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known
- CWE: CWE-269

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- SonicWall: Email Security

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-20021)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-20021)
- [https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-20021 · Markdown: https://rewindex.com/cve/CVE-2021-20021.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-20021 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:19.589Z