CVE-2021-20022

Name: CVE-2021-20022
Creator: NVD / NIST
Published: 2021-04-09T18:15:13.46+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10Actively ExploitedEPSS 16.51%

Last modified Jun 17, 2026

CVE-2021-20022 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.. CISA has confirmed active exploitation in the wild. EPSS estimates a 16.51% chance of exploitation in the next 30 days.

Description

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

16.51%

96.6th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 17, 2021.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sonicwall	Email Security	< 10.0.9.6103
Sonicwall	Email Security Appliance 9000 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 3300 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 4300 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 8300 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 5000 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 7000 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 5050 Firmware	< 10.0.9.6105
Sonicwall	Email Security Appliance 7050 Firmware	< 10.0.9.6105
Sonicwall	Email Security Virtual Appliance	< 10.0.9.6105
Sonicwall	Hosted Email Security	< 10.0.9.6103

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20022US Government Resource

Timeline

Published: Apr 9, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-20022?

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.

How severe is CVE-2021-20022?

CVE-2021-20022 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 16.51% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-20022?

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-2021-20022?

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

Scan your code now

Source: NVD / NIST