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Findings

CVE-2021-20038

SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability

Published Dec 8, 2021 · updated Jun 16, 2026 · sonicwall sma 200 firmware

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.

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.

Required action

Apply updates per vendor instructions.

CISA due date Feb 11, 2022

Affected

  • 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

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

References