CVE-2018-20753: Kaseya VSA Remote Code Execution Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-04-13. EPSS: 29.6% chance of exploitation in the next 30 days.

Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.

Affected products

• Kaseya Virtual System Administrator: from 9.3, before 9.3.0.35 (fixed in 9.3.0.35); from 9.4, before 9.4.0.36 (fixed in 9.4.0.36); from 9.5, before 9.5.0.5 (fixed in 9.5.0.5)

Published 2019-02-05. Last modified 2026-08-13.