Known exploited · Kaseya
CVE-2018-20753: Kaseya VSA Remote Code Execution Vulnerability
What it is
Kaseya VSA RMM allows unprivileged remote attackers to execute PowerShell payloads on all managed devices.
- Vendor
- Kaseya
- Product
- Virtual System/Server Administrator (VSA)
- Added to KEV
- April 13, 2022
- CISA due date
- May 4, 2022
- Ransomware use
- Known
- Weakness
- Not mapped by CISA
What CISA requires
Apply updates per vendor instructions.
Forensic triage
No
What to do now
- Find every instance of Virtual System/Server Administrator (VSA) you run, including the forgotten ones, and check its version against the vendor advisory.
- Apply the vendor's fix or mitigation, before May 4, 2022 if you are bound by CISA's deadline, sooner if it faces the internet.
- Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
References
H2 Security
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Start freeSource: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.