CVEvulnerability

CVE-2021-20021

9.8 CRITICAL Known exploited Published 2021-04-09 Modified 2026-08-12 Official page ↗

CISA Known Exploited Vulnerability

SonicWall Email Security Improper Privilege Management Vulnerability — SonicWall SonicWall Email Security

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.

Added to KEV
2021-11-03
Remediation due
2021-11-17
Ransomware use
Known
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-20021
Status
Analyzed
Published
2021-04-09
Last modified
2026-08-12
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-269

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.

Affected configurations

• sonicwall email security (< 10.0.9.6103) • sonicwall email security appliance 9000 firmware (< 10.0.9.6105) • sonicwall email security appliance 3300 firmware (< 10.0.9.6105) • sonicwall email security appliance 4300 firmware (< 10.0.9.6105) • sonicwall email security appliance 8300 firmware (< 10.0.9.6105) • sonicwall email security appliance 5000 firmware (< 10.0.9.6105) • sonicwall email security appliance 7000 firmware (< 10.0.9.6105) • sonicwall email security appliance 5050 firmware (< 10.0.9.6105) • sonicwall email security appliance 7050 firmware (< 10.0.9.6105) • sonicwall email security virtual appliance (< 10.0.9.6105) • sonicwall hosted email security (< 10.0.9.6103)

Related

Weakness · CWE (1)

  • CWE-269 Improper Privilege Management weakness

References