SonicWall SonicWall Email Security
YES - ON THE CISA KEV LIST
CVE-2021-20022
SonicWall Email Security Unrestricted Upload of File Vulnerability
overdue since 2021-11-17
SonicWall: 20 entries (1.1% of all KEV entries are from this vendor); 5 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
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 (CISA)
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-20022
References
Other KEV entries for this vendor: SonicWall
- CVE-2026-19868 - SonicOS SSLVPN (2026-11-06)
- CVE-2026-83548 - SMA1000 Appliances (2026-09-02)
- CVE-2026-83549 - SMA1000 Appliances (2026-09-02)
- CVE-2026-15409 - SMA1000 Appliances (2026-07-14)
- CVE-2026-15410 - SMA1000 Appliances (2026-07-14)
- CVE-2025-40602 - SMA1000 appliance (2025-12-17)
- CVE-2023-44221 - SMA100 Appliances (2025-05-01)
- CVE-2021-20035 - SMA100 Appliances (2025-04-16)
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