CVE-2021-20034

Name: CVE-2021-20034
Creator: NVD / NIST
Published: 2021-09-27T18:15:08.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 80.70%

Last modified Jun 17, 2026

CVE-2021-20034 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting in a reboot to factory default settings.. EPSS estimates a 80.70% chance of exploitation in the next 30 days.

Description

An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting in a reboot to factory default settings.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

80.70%

99.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sonicwall	Sma 200 Firmware	<= 9.0.0.10-28sv
Sonicwall	Sma 200 Firmware	>= 10.2.0.0, <= 10.2.0.7-34sv
Sonicwall	Sma 200 Firmware	>= 10.2.1.0, <= 10.2.1.0-17sv
Sonicwall	Sma 210 Firmware	<= 9.0.0.10-28sv
Sonicwall	Sma 210 Firmware	>= 10.2.0.0, <= 10.2.0.7-34sv
Sonicwall	Sma 210 Firmware	>= 10.2.1.0, <= 10.2.1.0-17sv
Sonicwall	Sma 400 Firmware	<= 9.0.0.10-28sv
Sonicwall	Sma 400 Firmware	>= 10.2.0.0, <= 10.2.0.7-34sv
Sonicwall	Sma 400 Firmware	>= 10.2.1.0, <= 10.2.1.0-17sv
Sonicwall	Sma 410 Firmware	<= 9.0.0.10-28sv
Sonicwall	Sma 410 Firmware	>= 10.2.0.0, <= 10.2.0.7-34sv
Sonicwall	Sma 410 Firmware	>= 10.2.1.0, <= 10.2.1.0-17sv
Sonicwall	Sma 500v	<= 9.0.0.10-28sv
Sonicwall	Sma 500v	>= 10.2.0.0, <= 10.2.0.7-34sv
Sonicwall	Sma 500v	>= 10.2.1.0, <= 10.2.1.0-17sv

References

http://packetstormsecurity.com/files/164564/SonicWall-SMA-10.2.1.0-17sv-Password-Reset.htmlExploit, Third Party Advisory, VDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021Vendor Advisory
http://packetstormsecurity.com/files/164564/SonicWall-SMA-10.2.1.0-17sv-Password-Reset.htmlExploit, Third Party Advisory, VDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021Vendor Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20034?

How severe is CVE-2021-20034?

CVE-2021-20034 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 80.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20034?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20034?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST