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CVE-2021-20038

UNKNOWN
Published 2021-12-08T09:55:20.000Z
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Expert Analysis

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CVSS Score

V3.1
9.8
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.943
probability
of exploitation in the wild

There is a 94.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.999
Higher than 99.9% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

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.

Available Exploits

SonicWall SMA100 Stack - Buffer Overflow/Remote Code Execution

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.

ID: CVE-2021-20038
Author: dwisiswant0jbaines-r7 Critical

References:

Related News

No news articles found for this CVE.

Affected Products

SonicWall

SonicWall SMA100

Affected Versions:

10.2.0.8-37sv and earlier 10.2.1.1-19sv and earlier 10.2.1.2-24sv and earlier

Known Exploited Vulnerability

This vulnerability is actively being exploited in the wild

View KEV Details

Remediation Status

Overdue

Due Date

February 11, 2022

Added to KEV

January 28, 2022

Required Action

Apply updates per vendor instructions.

Affected Product

Vendor/Project: SonicWall
Product: SMA 100 Appliances

Ransomware Risk

Known Ransomware Use
KEV Catalog Version: 2025.01.24 Released: January 24, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed CRITICAL

GHSA-jmhc-vxg9-h2g4

Advisory Details

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 Scoring

CVSS Score

9.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-20038
WEB https://github.com/jbaines-r7/badblood
WEB https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
WEB https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2

Advisory provided by GitHub Security Advisory Database. Published: December 9, 2021, Modified: February 4, 2025

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
https://github.com/jbaines-r7/badblood
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/
Published: 2021-12-08T09:55:20.000Z
Last Modified: 2025-07-28T19:47:56.167Z
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