CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2021-20021
Critical (9.8) in SonicWall SonicWall Email Security. In CISA KEV since 2021-11-03, with known ransomware use. EPSS 89% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 89% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
- CISA KEV
- listed 2021-11-03, due 2021-11-17, known ransomware use
- CWE
- CWE-269
- Published
- Modified
- Record from
- the NVD, synced
Affected
- sonicwall:email_security
- sonicwall:email_security_appliance_3300_firmware
- sonicwall:email_security_appliance_4300_firmware
- sonicwall:email_security_appliance_5000_firmware
- sonicwall:email_security_appliance_5050_firmware
- sonicwall:email_security_appliance_7000_firmware
- sonicwall:email_security_appliance_7050_firmware
- sonicwall:email_security_appliance_8300_firmware
- sonicwall:email_security_appliance_9000_firmware
- sonicwall:email_security_virtual_appliance
- sonicwall:hosted_email_security