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CVE-2021-30120 is an authentication bypass vulnerability in Kaseya VSA before version 9.5.7 that defeats the product’s two-factor authentication enforcement. During login, after successful primary authentication with a valid username and password, the server returns client-consumed state values indicating whether multi-factor authentication is required and enrolled. Because the requirement for the second factor is enforced on the client side rather than validated server side, an attacker who can intercept and modify the login flow can alter the MFA-required flag and suppress the second-factor prompt while still completing authentication. This design flaw renders 2FA ineffective for affected deployments.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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