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CVE-2021-30120 is a two-factor authentication bypass in Kaseya VSA caused by enforcing the second-factor requirement on the client rather than the server. After successful username-and-password authentication, the server returns flags indicating whether multifactor authentication is required and enrolled. An attacker possessing valid credentials can use an intercepting proxy to change the requirement flag from true to false, suppressing the second-factor prompt while still obtaining a logged-in session. The vulnerability was patched in VSA 9.5.7a; affected-version descriptions differ on whether version 9.5.7 itself is included.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day vulnerability in Kaseya VSA used as part of the 2021 supply-chain compromise that enabled access to VSA servers and facilitated ransomware deployment to downstream victims.
A two-factor authentication bypass vulnerability in Kaseya VSA, one of three outstanding zero-day vulnerabilities fixed in VSA 9.5.7a. The content does not specifically identify this CVE as the authentication bypass used in the ransomware attack. No public proof-of-concept exploit was reported at publication.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.