CVE-2021-20038
SonicWall SMA 100 Appliances Stack-Based Buffer Ov - [Actively Exploited]
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.
INFO
Published Date :
Dec. 8, 2021, 10:15 a.m.
Last Modified :
March 14, 2025, 4:48 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2021-20038
Public PoC/Exploit Available at Github
CVE-2021-20038 has a 14 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-20038
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-20038.
| URL | Resource |
|---|---|
| https://github.com/jbaines-r7/badblood | Exploit Third Party Advisory |
| https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 | Vendor Advisory |
| https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ | Exploit Third Party Advisory |
| https://github.com/jbaines-r7/badblood | Exploit Third Party Advisory |
| https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 | Vendor Advisory |
| https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
None
None
None
None
None
None
Python
None
None
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
A collection of nmap scripts for different CVEs
cve nmap vulnerability cve-2021-20038 cve-2019-1653
Lua
本项目用于搜集 2022 年的漏洞，注意：本项目并不刻意搜集 POC 或 EXP，主要以CVE-2021、CVE-2022 为关键词，包含但不限于漏洞资讯、漏洞复现、漏洞分析、漏洞验证、漏洞利用
SonicWall SMA-100 Unauth RCE Exploit (CVE-2021-20038)
exploit rce cve-2021-20038
Python
essential templates for kenzer [DEPRECATED]
kenzer vulnerabilities kenzer-templates arpsyndicate
Python Shell Ruby
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-20038 vulnerability anywhere in the article.
-
Daily CyberSecurity
SonicWall SMA Devices Under Attack: UNC6148 Deploys OVERSTEP Rootkit for Persistent Access
Google’s Threat Intelligence Group (GTIG) uncovers a stealthy, sophisticated campaign led by a financially motivated actor tracked as UNC6148. This campaign targets end-of-life SonicWall Secure Mobile ... Read more
-
Ars Technica
Google finds custom backdoor being installed on SonicWall network devices
Researchers from the Google Threat Intelligence Group said that hackers are compromising SonicWall Secure Mobile Access (SMA) appliances, which sit at the edge of enterprise networks and manage and se ... Read more
-
BleepingComputer
SonicWall SMA devices hacked with OVERSTEP rootkit tied to ransomware
A threat actor has been deploying a previously unseen malware called OVERSTEP that modifies the boot process of fully-patched but no longer supported SonicWall Secure Mobile Access appliances. The bac ... Read more
-
The Register
Crims hijacking fully patched SonicWall VPNs to deploy stealthy backdoor and rootkit
Unknown miscreants are exploiting fully patched, end-of-life SonicWall VPNs to deploy a previously unknown backdoor and rootkit, likely for data theft and extortion, according to Google's Threat Intel ... Read more
-
The Hacker News
UNC6148 Backdoors Fully-Patched SonicWall SMA 100 Series Devices with OVERSTEP Rootkit
A threat activity cluster has been observed targeting fully-patched end-of-life SonicWall Secure Mobile Access (SMA) 100 series appliances as part of a campaign designed to drop a backdoor called OVER ... Read more
The following table lists the changes that have been made to the
CVE-2021-20038 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Mar. 14, 2025
Action Type Old Value New Value Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* Changed CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 04, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-787 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/jbaines-r7/badblood Added Reference https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 Added Reference https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
May. 13, 2022
Action Type Old Value New Value Changed Reference Type https://github.com/jbaines-r7/badblood No Types Assigned https://github.com/jbaines-r7/badblood Exploit, Third Party Advisory Changed Reference Type https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ No Types Assigned https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ Exploit, Third Party Advisory -
CVE Modified by [email protected]
Apr. 29, 2022
Action Type Old Value New Value Added Reference https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ [No Types Assigned] Added Reference https://github.com/jbaines-r7/badblood [No Types Assigned] -
Initial Analysis by [email protected]
Dec. 10, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 No Types Assigned https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 Vendor Advisory Added CWE NIST CWE-787 Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_400_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.0.8-37sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.1-19sv:*:*:*:*:*:*:* *cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.2-24sv:*:*:*:*:*:*:* OR cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-20038 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-20038
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
94.31 }} -2.39%
score
0.99938
percentile