CVE-2021-42258: BQE BillQuick Web Suite SQL Injection Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 74.4% chance of exploitation in the next 30 days.

BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows SQL injection for unauthenticated remote code execution, as exploited in the wild in October 2021 for ransomware installation. SQL injection can, for example, use the txtID (aka username) parameter. Successful exploitation can include the ability to execute arbitrary code as MSSQLSERVER$ via xp_cmdshell.

Affected products

• BQE BillQuick Web Suite: from 19, before 22.0.9.1 (fixed in 22.0.9.1)

Published 2021-10-22. Last modified 2026-06-17.