ACTIVELY EXPLOITED
CVE-2021-20038: SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
| Vendor | SonicWall |
|---|---|
| Product | SMA 100 Appliances |
| Actively exploited | Yes |
| Added to CISA KEV | 28 Jan 2022 |
| CISA federal deadline | 11 Feb 2022 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-121 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
SOURCES
Other SonicWall flaws
- CVE-2026-19868: SonicWall SonicOS SSLVPN Use of Single-factor Authentication Vulnerability
- CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability
- CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
- CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability
- CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.