CVE-2021-20021
SonicWall Email Security Improper Privilege Management Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-20021
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation Context
as of October 15, 2026- CISA added CVE-2021-20021 to the KEV catalog 208 days after its CVE record was published.
- It is one of 19 SonicWall entries in the CISA KEV catalog, and one of 5 added in 2021.
- Its current EPSS score (88.8%) is higher than that of 72% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| SonicWall | SonicWall Email Security | 10.0.9 and earlier |
References
1 LinksRecord Details
More from SonicWall
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Related
Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.