CVE•Published 2021-04-09•Modified 2026-08-12•1 article on news•5 live references•NVD data
CVE-2021-20021Sonicwall · Email_security
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
100
Exploit Prediction Scoring System · top 0% of all CVEs
Weaknesses (CWE)
Description
A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.
Timeline
Published 2021-04-09
Modified 2026-08-12
External references
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-2021-20021Hosts 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-2021-20021Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-20021Censys host search filtered to this CVE id.
grep.app
CVE-2021-20021Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-20021GitHub code search for direct mentions.
Google dork
"CVE-2021-20021" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (3)
CVE-2021-200213 repos