# CVE-2021-20023: SonicWall Email Security Path Traversal Vulnerability

> CVE-2021-20023: SonicWall Email Security Path Traversal Vulnerability. CVSS 4.9 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-20023
Last updated: 2026-10-01T20:20:16Z

- Published: 2021-04-20 11:55 UTC · Updated: 2026-10-01 20:20 UTC · Assigner: sonicwall
- CVSS: 4.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
- EPSS: 51.7%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known
- CWE: CWE-22

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- SonicWall: Email Security

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-20023)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-20023)
- [https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-20023 · Markdown: https://rewindex.com/cve/CVE-2021-20023.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-20023 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:42.601Z