Vulnerability Intelligence Report
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
CVE-2021-20038
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:99.91%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-121 ↗CWE-121: Stack-based Buffer Overflow
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| SonicWall | SonicWall SMA100 | 10.2.0.8-37sv and earlier (affected), 10.2.1.1-19sv and earlier (affected), 10.2.1.2-24sv and earlier (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
99.912%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | SonicWall, Inc. · Vendor · USA |
| Reserved | 2020-12-17T00:00:00 |
| Published | 2021-12-08T09:55:20 |
| Last Updated | 2025-10-21T23:25:23 |
Community Chatter & Buzz