PT-2021-2799 · Sonicwall · Sonicwall Hosted Email Security+1

Published 2021-04-09 · Updated 2025-06-24 · CVE-2021-20022

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions SonicWall Email Security version 10.0.9.x SonicWall Hosted Email Security (affected versions not specified)

Description The issue is related to insufficient file checking during upload, allowing a remote attacker to gain unauthorized access to protected information by uploading a malicious ZIP archive. This can impact the confidentiality, integrity, and availability of the protected information. The vulnerability can be exploited by a post-authenticated attacker to upload an arbitrary file to the remote host.

Recommendations For SonicWall Email Security version 10.0.9.x, consider restricting file uploads until a patch is available. For SonicWall Hosted Email Security, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

BDU:2021-02344

BDU:2021-06040

CVE-2021-20022

Affected Products

Sonicwall Email Security

Sonicwall Hosted Email Security

References · 13

• https://nvd.nist.gov/vuln/detail/CVE-2021-20022 · Security Note
• https://bdu.fstec.ru/vul/2021-02344 · Security Note
• https://bdu.fstec.ru/vul/2021-06040 · Security Note
• https://osv.dev/vulnerability/CVE-2021-20022 · Vendor Advisory
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008 · Vendor Advisory
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20022 · Note
• https://cybersecurity-help.cz/vdb/SB2021041210 · Note
• https://fireeye.com/blog/threat-research/2021/04/zero-day-exploits-in-sonicwall-email-security-lead-to-compromise.html · Note
• https://t.me/nekaspersky/777 · Telegram Post
• https://t.me/ckure/7688 · Telegram Post
• https://securitylab.ru/news/519133.php · Note
• https://cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv · Note
• https://twitter.com/DefusedCyber/status/1937437493214765122 · Twitter Post