CVE-2021-20023

SonicWall Email Security

Published 20 Apr 2021 · updated 1 Oct 2026 · Analyzed

4.9 Medium · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 17 Nov 2021 for US federal agencies. It has been used in ransomware campaigns.

Required action: Apply updates per vendor instructions.

Description

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

References

psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010 · Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023 · US Government Resource