Vulnerability Details : CVE-2021-20038

Public exploit exists!
Used for ransomware!
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.
Published 2021-12-08 10:15:08
Updated 2025-03-14 16:48:27
Source SonicWALL, Inc.
View at NVD,   CVE.org
Vulnerability category: OverflowExecute code

Products affected by CVE-2021-20038

CVE-2021-20038 is in the CISA Known Exploited Vulnerabilities Catalog

This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-20038
Added on 2022-01-28 Action due date 2022-02-11

Exploit prediction scoring system (EPSS) score for CVE-2021-20038

EPSS FAQ
94.31%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 100 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20038

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
 NIST
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 134c704f-9b21-4f2e-91b3-4a467353bcc0 2025-02-04
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST

CWE ids for CVE-2021-20038

  • A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
    Assigned by: PSIRT@sonicwall.com (Primary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Primary)
    • nvd@nist.gov (Secondary)

References for CVE-2021-20038

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