CVE-2021-20021 is a critical vulnerability in SonicWall Email Security versions 10.0.9.x that allows an unauthenticated attacker to create an administrative account by sending a specially crafted HTTP request. With a CVSS score of 9.8, this flaw is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. The vulnerability is actively exploited in the wild, including in known ransomware campaigns like HelloKitty, and has garnered significant community and media attention, despite the lack of public Metasploit or ExploitDB modules.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 10.0.9.6103CPE matchmatch criteria | cpe:2.3:a:sonicwall:email_security:*:*:*:*:*:*:*:* | ||
< 10.0.9.6105CPE matchmatch criteria | cpe:2.3:o:sonicwall:email_security_appliance_9000_firmware:*:*:*:*:*:*:*:* | ||
< 10.0.9.6105CPE matchmatch criteria | cpe:2.3:o:sonicwall:email_security_appliance_3300_firmware:*:*:*:*:*:*:*:* | ||
< 10.0.9.6105CPE matchmatch criteria | cpe:2.3:o:sonicwall:email_security_appliance_4300_firmware:*:*:*:*:*:*:*:* | ||
< 10.0.9.6105CPE matchmatch criteria | cpe:2.3:o:sonicwall:email_security_appliance_8300_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.