Is CVE-2021-20038 actively exploited?

CVE-2021-20038 has no public evidence of in-the-wild exploitation as of 2025-10-31.

What is the CVSS score for CVE-2021-20038?

CVE-2021-20038 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-20038?

Patch guidance is available from sonicwall security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-20038.

Fix CVE-2021-20038 - CRITICAL sonicwall sma 200 firmware

Q: Which products are affected by CVE-2021-20038?

15 products: sonicwall sma 200 firmware, sonicwall sma 200 firmware, sonicwall sma 200 firmware, sonicwall sma 210 firmware, sonicwall sma 210 firmware, and 10 more.

Description

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-121 CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: SONICWALL
Published: 12/8/2021
Last Modified: 10/31/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

sonicwall : sma_200_firmwaresonicwall : sma_200_firmwaresonicwall : sma_200_firmwaresonicwall : sma_210_firmwaresonicwall : sma_210_firmwaresonicwall : sma_210_firmwaresonicwall : sma_410_firmwaresonicwall : sma_410_firmwaresonicwall : sma_410_firmwaresonicwall : sma_400_firmwaresonicwall : sma_400_firmwaresonicwall : sma_400_firmwaresonicwall : sma_500v_firmwaresonicwall : sma_500v_firmwaresonicwall : sma_500v_firmware

Remediation Guidance

Executive Summary

View on NIST NVD