SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability

Are you affected?

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• cpe sonicwall/sma 200 firmware10.2.0.8-37sv
• cpe sonicwall/sma 200 firmware10.2.1.1-19sv
• cpe sonicwall/sma 200 firmware10.2.1.2-24sv
• cpe sonicwall/sma 210 firmware10.2.0.8-37sv
• cpe sonicwall/sma 210 firmware10.2.1.1-19sv
• cpe sonicwall/sma 210 firmware10.2.1.2-24sv
• cpe sonicwall/sma 400 firmware10.2.0.8-37sv
• cpe sonicwall/sma 410 firmware10.2.0.8-37sv
• cpe sonicwall/sma 410 firmware10.2.1.1-19sv
• cpe sonicwall/sma 500v firmware10.2.0.8-37sv
• vendor SonicWall SMA 100 Appliancesversion unspecified

How to fix CVE-2021-20038

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Feb 11, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Dec 8, 2021 · Catalog

   Detected

   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.

2. Jan 28, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Feb 11, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2021-20038

  SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-20038

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-20038

  30-day exploitation probability 99.9%

  first.org
• Metasploit ModulesPublic exploit moduleexploit_linux/http/sonicwall_cve_2021_20039

  Public module reference (excellent). Module source is not copied into this catalog.

  rapid7.com
• NIST NVDVulnerability recordCVE-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 a

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-20038

  SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.

  vulncheck.com

References

• VulnCheck exploitation evidence · 4502402.fs1.hubspotusercontent-na1.net
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• Exploit · github.com
• CISA note · nvd.nist.gov
• Vendor Advisory · psirt.global.sonicwall.com
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• Exploit · rapid7.com

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.