CVE-2021-20023Actively exploitedAdded to KEV 2021-11-03Known ransomware campaign use

SonicWall Email Security Path Traversal Vulnerability

SonicWall, SonicWall Email Security

Description

SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

Critical

51.7%

estimated chance of real-world exploitation in the next 30 days, higher than 98.9% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2021-11-17

CWE-22

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