Kaseya VSA → REvil Supply-Chain Ransomware
July 2021 REvil ransomware attack through the Kaseya VSA remote-management platform — a software-supply-chain breach that encrypted up to 1,500 managed service providers and their customers.
The July 2021 Kaseya VSA attack let REvil encrypt up to ~1,500 downstream businesses by compromising the vendor's own remote-management console, proving that MSP supply chains are prime ransomware targets.
Definition
Supply-chain exploit of Kaseya VSA authentication to push a malicious agent update that deployed REvil ransomware to on-premises and managed clients of MSPs using VSA.
Why It Matters / Impact
Hundreds of MSPs and ~1,500 downstream organizations affected; a universal Kaseya-provided decryption key later released; spurred Kaseya to harden the platform.
Current Status
- Review status: published
- Last updated: 2026-08-26
- Evidence: 2 source(s) · 1 CVE(s) linked
- Confidence: 93%
Related Malware
Timeline
- 2021-07-02 — REvil exploits Kaseya VSA; ransomware deployed to MSP clients
- 2021-07-04 — CISA issues guidance; Kaseya isolates VSA SaaS
- 2021-07-14 — Kaseya validates fix; REvil decryptor published
Sources
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