CVE•Published 2021-04-20•Modified 2026-10-01•1 article on news•5 live references•NVD data

CVE-2021-20023Sonicwall · Email_security

Vulnerability data via NVD (ingested)

CVSS v3.1

4.9

MEDIUM

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

EPSS percentile

Exploit Prediction Scoring System · top 1% of all CVEs

Weaknesses (CWE)

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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.

Timeline

Published 2021-04-20

Modified 2026-10-01

External references

NVD MITRE GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2021-20023

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Sonicwall Email Security"

All exposed Sonicwall Email Security instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Email Security"

HTTP body or banner mentions "Email Security" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-20023