CVE-2021-20021
CISA KEV RANSOMWARE
ACT NOW
Priority: 0.00
BB Relevance:
0/100
Published: N/A
Modified: N/A
First seen: 2026-10-29
Status: pending_score
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.
CISA Known Exploited Vulnerability
Vendor / Product
SonicWall — SonicWall Email Security
Date Added
2021-11-03
Remediation Due
2021-11-17
Ransomware Use
CONFIRMED
https://nvd.nist.gov/vuln/detail/CVE-2021-20021
Weakness Classification (1)
Affected Software (11)
| Vendor | Product | Version |
|---|---|---|
| sonicwall | email_security | < 10.0.9.6103 |
| sonicwall | email_security_appliance_3300_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_4300_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_5000_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_5050_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_7000_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_7050_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_8300_firmware | < 10.0.9.6105 |
| sonicwall | email_security_appliance_9000_firmware | < 10.0.9.6105 |
| sonicwall | email_security_virtual_appliance | < 10.0.9.6105 |
| sonicwall | hosted_email_security | < 10.0.9.6103 |
References & Advisories (2)
Vendor Advisory
US Government Resource