CVE-2021-30121: Kaseya VSA

Medium severity, CVSS 6.5. EPSS: 4.8% chance of exploitation in the next 30 days.

Semi-authenticated local file inclusion The contents of arbitrary files can be returned by the webserver Example request: `https://x.x.x.x/KLC/js/Kaseya.SB.JS/js.aspx?path=C:\Kaseya\WebPages\dl.asp` A valid sessionId is required but can be easily obtained via CVE-2021-30118

Affected products

• Kaseya VSA: before 9.5.6 (fixed in 9.5.6)

Published 2021-07-09. Last modified 2026-06-17.