CVE-2021-20042

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

An unauthenticated remote attacker can use SMA 100 as an unintended proxy or intermediary undetectable proxy to bypass firewall rules. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-441

Affected software

Vendor	Product	Versions
SonicWall	SonicWall SMA100	9.0.0.11-31sv and earlier; 10.2.0.8-37sv and earlier; 10.2.1.1-19sv and earlier; 10.2.1.2-24sv and earlier

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory

Timeline

Published: Dec 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-200438.8A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacker to potentially exe CVE-2021-200448.8A post-authentication remote command injection vulnerability in SonicWall SMA100 allows a remote authenticated attacker to execute OS system CVE-2021-200459.8A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potential CVE-2021-200468.8A Stack-based buffer overflow in the SonicOS HTTP Content-Length response header allows a remote authenticated attacker to cause Denial of S CVE-2021-200477.8SonicWall Global VPN client version 4.10.6 (32-bit and 64-bit) and earlier have a DLL Search Order Hijacking vulnerability. Successful explo CVE-2021-200488.8A Stack-based buffer overflow in the SonicOS SessionID HTTP response header allows a remote authenticated attacker to cause Denial of Servic CVE-2021-200497.5A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration base CVE-2021-20054.7Vulnerability in the Oracle Business Intelligence Enterprise Edition product of Oracle Fusion Middleware (component: BI Platform Security). CVE-2021-200507.5An Improper Access Control Vulnerability in the SMA100 series leads to multiple restricted management APIs being accessible without a user l CVE-2021-200517.8SonicWall Global VPN Client 4.10.7.1117 installer (32-bit and 64-bit) and earlier versions have a DLL Search Order Hijacking vulnerability i CVE-2021-20065.3Vulnerability in the MySQL Client product of Oracle MySQL (component: C API). Supported versions that are affected are 8.0.19 and prior. Dif CVE-2021-200665.6JSDom improperly allows the loading of local resources, which allows for local files to be manipulated by a malicious web page when script e