CVE-2021-20039

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-78

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

http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Vendor Advisory
https://attackerkb.com/topics/9szJhq46lw/cve-2021-20039/rapid7-analysis

Timeline

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

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