CVE-2021-30116
Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability
Kaseya · Virtual System/Server Administrator (VSA)
Vulnerability details
Kaseya Virtual System/Server Administrator (VSA) contains an information disclosure vulnerability allowing an attacker to obtain the sessionId that can be used to execute further attacks against the system.
Added to CISA KEV: 2021-11-03
Ransomware campaign use: Known
CISA due date: 2021-11-17
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC