CVE-2021-20038
Quick assessment
Affected
SonicWall SonicWall SMA100
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Sonicwall SMA100是美国Sonicwall公司的一款安全访问网关设备。 SonicWall SMA100 Apache httpd 服务器的 mod_cgi 模块环境变量中存在缓冲区错误漏洞，该漏洞允许未经身份验证的远程攻击者潜在地以设备中的nobody用户身份执行代码。此漏洞影响 SMA 200、210、400、410 和 500v 设备固件 10.2.0.8-37sv、10.2.1.1-19sv、10.2.1.2-24sv 和更早版本。
Public Exploits 1
Nuclei · 1
CVE-2021-20038.yaml [template]
In-the-Wild Activity Observed
cisa_kev · confirmed
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-20038
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Sonicwall SMA100 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sonicwall SMA100是美国Sonicwall公司的一款安全访问网关设备。 SonicWall SMA100 Apache httpd 服务器的 mod_cgi 模块环境变量中存在缓冲区错误漏洞，该漏洞允许未经身份验证的远程攻击者潜在地以设备中的nobody用户身份执行代码。此漏洞影响 SMA 200、210、400、410 和 500v 设备固件 10.2.0.8-37sv、10.2.1.1-19sv、10.2.1.2-24sv 和更早版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| SonicWall | SonicWall SMA100 | 10.2.0.8-37sv and earlier | - |
|
II. Public POCs for CVE-2021-20038
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | SonicWall SMA-100 Unauth RCE Exploit (CVE-2021-20038) | https://github.com/jbaines-r7/badblood | POC Details |
| 2 | None | https://github.com/vesperp/CVE-2021-20038-SonicWall-RCE | POC Details |
| 3 | 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. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20038.yaml | POC Details |
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-20038
请登录查看更多情报信息。
Security Blog Posts for CVE-2021-20038 (1)
Other References for CVE-2021-20038 (2)
-
https://github.com/jbaines-r7/badblood x_refsource_MISC
-
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 x_refsource_CONFIRM
Same Patch Batch · SonicWall · 2021-12-08 · 9 CVEs total
| CVE-2021-20047 | SonicWall Global VPN client 代码问题漏洞 | |
| CVE-2021-20045 | SonicWall SMA100 安全漏洞 | |
| CVE-2021-20044 | Sonicwall SMA100 操作系统命令注入漏洞 | |
| CVE-2021-20043 | Sonicwall SMA100 缓冲区错误漏洞 | |
| CVE-2021-20042 | SonicWall SMA100 安全漏洞 | |
| CVE-2021-20041 | SonicWall SMA100安全漏洞 | |
| CVE-2021-20040 | Sonicwall SMA100 路径遍历漏洞 | |
| CVE-2021-20039 | Sonicwall SMA100 操作系统操作系统命令注入漏洞 |
IV. Related Vulnerabilities
Same weakness: CWE-121
-
CVE-2026-105285
Totolink A3002MU QoS Rule formIpQoS stack-based overflow -
CVE-2026-20521
Android Video HAL未检查边界致权限提升漏洞 -
CVE-2026-66837
Apache Thrift: PHP accelerator sizes a stack buffer from a w -
CVE-2026-104611
Tenda AC9 POST Request fast_setting_internet_set stack-based -
CVE-2026-104610
Tenda HG7/HG9/HG10 Boa Web Server formLoopBack boaGetVar sta
V. Comments for CVE-2021-20038
No comments yet