CVE-2021-20028: SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability

Vulnerability summary

CVE-2021-20028 is a critical (CVSS 9.8) SQL Injection vulnerability in SonicWall Secure Remote Access (SRA). It is known to be exploited: CISA lists it, first on 28-03-2022. It has been used in ransomware campaigns. EPSS estimates a 30.08% chance of exploitation in the next 30 days, higher than 98.2% of scored vulnerabilities.

Timeline

1. 04-08-2021
   PublishedVulnerability first disclosed.
2. 28-03-2022
   Added to CISA KEVSonicWall Secure Remote Access (SRA) SQL Injection Vulnerability
3. 18-04-2022
   CISA remediation dueThe impacted product is end-of-life and should be disconnected if still in use.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

Improper neutralization of a SQL Command leading to SQL Injection vulnerability impacting end-of-life Secure Remote Access (SRA) products, specifically the SRA appliances running all 8.x firmware and 9.0.0.9-26sv or earlier

• 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.