CVE-2021-20021CISA KEVEPSS p99.8%
CVE-2021-20021SonicWall Email Security Improper Privilege Management Vulnerability
SonicWall / SonicWall Email Security
Description
SonicWall Email Security contains an improper privilege management vulnerability that allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20022 and CVE-2021-20023 to achieve privilege escalation.
Scoring
| CVSS | 9.8 () |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 88.67% probability of exploitation · percentile 99.8% · 2026-10-03T12:00:21Z |
| Last modified | 2026-08-12 |
CISA KEV entry
Added to KEV: 2021-11-03
(incoming)1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| KEVEntry | SonicWall Email Security Improper Privilege Management Vulnerabilitykev-cve-2021-20021 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.