CVE-2021-20021
SonicWall Email Security Improper Privilege Management Vulnerability
IN CISA KEV
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.
- Vendor
- SonicWall
- Product
- SonicWall Email Security
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-306
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2021-11-03
- Due date
- 2021-11-17
- Ransomware use
- Known
- Required action
- Apply updates per vendor instructions.
EPSS
88.8% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.