Critical Arbitrary File Delete Vulnerability In SonicWall SMA 100 Series Appliances [CVE-2021-20034]

CVE number – CVE-2021-20034

A critical vulnerability in SonicWall SMA 100 series appliances, which includes SMA 200, 210, 400, 410 and 500v, could potentially allow a remote unauthenticated attacker the ability to delete arbitrary files from a SMA 100 series appliance and potentially gain administrator access to the device.

The vulnerability is due to an improper limitation of a file path to a restricted directory potentially leading to arbitrary file deletion as ‘nobody.’

SonicWall strongly urges that organizations follow the guidance below to patch SMA 100 series products, which include SMA 200, 210, 400, 410 and 500v.

Impacted PlatformsImpacted Versions
 SMA 100 Series
(SMA 200, 210, 400, 410, 500v) and earlier10.2.0.7-34sv and earlier9.0.0.10-28sv and earlier

Organizations using SMA 100 series appliances should immediately log in to to upgrade their appliances to the patched firmware versions. For upgrade assistance, please reference the KB article, “How to Upgrade Firmware on SMA 100 Series Appliances”  or contact SonicWall support.


ProductPlatformImpacted VersionFixed Version
SMA 100 Series• SMA 200
• SMA 210
• SMA 400
• SMA 410
• SMA 500v (ESX, KVM, AWS, Azure) and earlier and earlier and earlier and higher and higher and higher

Jason Davies

UK based technology professional, with an interest in computer security and telecoms.

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