November 3, 2021 · Applied Cybernetics Group
CVE-2021-20021 — SonicWall SonicWall Email Security
known ransomware use
SonicWall Email Security Improper Privilege Management Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- SonicWall
- Product
- SonicWall Email Security
- EPSS
- 99.7th percentile (score 0.912, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-20021
CISA short description
SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.
Required action
Apply updates per vendor instructions.