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CVE-2021-20023: SonicWall Email Security Path Traversal Vulnerability
SonicWall SonicWall Email Security · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2021-11-17federal remediation due date
51.41%EPSS exploit probability (30 days) 98.9th percentile
4.9 MEDIUMCVSS 3.1
Knownknown ransomware use
197days from NVD publication to KEV
What it is
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.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-22 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
| NVD published | 2021-04-20 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-20023.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.