SonicWall SMA 100 Appliances
YES - ON THE CISA KEV LIST
CVE-2021-20038
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
overdue since 2022-02-11
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 SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
Required action (CISA)
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-20038
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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