November 3, 2021 · Applied Cybernetics Group
CVE-2021-20022 — SonicWall SonicWall Email Security
known ransomware use
SonicWall Email Security Unrestricted Upload of File Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- SonicWall
- Product
- SonicWall Email Security
- EPSS
- 97.0th percentile (score 0.326, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-20022
CISA short description
SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.
Required action
Apply updates per vendor instructions.