Cybersecurity Briefing — Kaseya VSA supply-chain ransomware attack
On 2 July 2021 REvil exploited zero-days in Kaseya VSA to push ransomware to managed service providers and downstream clients, prompting emergency patching and incident response guidance from CISA and FBI.
The Kaseya VSA compromise began on 2 July 2021 when attackers leveraged unpatched vulnerabilities to deploy REvil ransomware through on-premises VSA servers used by managed service providers. CISA and the FBI urged immediate server shutdowns, network isolation, and monitoring while Kaseya prepared fixes.
Organizations that rely on MSPs should validate vendor patching and access controls, review remote management exposure, and implement application allowlisting and MFA to curb similar supply-chain intrusion paths.
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