CVE-2021-20020

Name: CVE-2021-20020
Creator: NVD / NIST
Published: 2021-04-10T07:15:10.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.73%

Last modified Jun 17, 2026

CVE-2021-20020 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A command execution vulnerability in SonicWall GMS 9.3 allows a remote unauthenticated attacker to locally escalate privilege to root.. EPSS estimates a 3.73% chance of exploitation in the next 30 days.

Description

A command execution vulnerability in SonicWall GMS 9.3 allows a remote unauthenticated attacker to locally escalate privilege to root.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.73%

88.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sonicwall	Global Management System	9.3

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0009Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0009Vendor Advisory

Timeline

Published: Apr 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20020?

A command execution vulnerability in SonicWall GMS 9.3 allows a remote unauthenticated attacker to locally escalate privilege to root.

How severe is CVE-2021-20020?

CVE-2021-20020 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20020?

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-2021-20020?

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

Scan your code now

Source: NVD / NIST