CVE-2021-20016: SonicWall SSLVPN SMA100 SQL Injection Vulnerability

Vulnerability summary

CVE-2021-20016 is a critical (CVSS 9.8) SQL Injection vulnerability in SonicWall SSLVPN SMA100. It is known to be exploited: CISA lists it, first on 03-11-2021. It has been used in ransomware campaigns. EPSS estimates a 40.04% chance of exploitation in the next 30 days, higher than 98.6% of scored vulnerabilities.

Timeline

1. 03-02-2021
   PublishedVulnerability first disclosed.
2. 03-11-2021
   Added to CISA KEVSonicWall SSLVPN SMA100 SQL Injection Vulnerability
3. 17-11-2021
   CISA remediation dueApply updates per vendor instructions.
4. 12-08-2026
   Last modifiedVulnerability information updated.

Description

A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

• CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.