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CVE-2021-30116 is a critical vulnerability in Kaseya VSA on-premises deployments before version 9.5.7. The issue combines an unauthenticated credential disclosure condition with a business logic flaw in the default client download workflow exposed through the product’s download page. A downloaded and installed Windows agent generates a configuration file containing agent authentication material, including an agent identifier and password. Those credentials can then be submitted back to the download functionality to obtain an authenticated session token intended for agent-related use. Due to insufficient separation of privileges and flawed authentication logic, the resulting session can be reused against services not intended to be accessible to agents, enabling authentication bypass and follow-on semi-authenticated attacks. The flaw was exploited in the wild in July 2021 and was associated with the broader Kaseya VSA compromise activity.
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What an attacker gets, and what they’ve been doing with it.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated credential disclosure and business logic flaw in Kaseya VSA that can leak agent credentials and allow attackers to obtain a sessionId cookie for semi-authenticated follow-on attacks, enabling authentication bypass against affected systems.
A Kaseya VSA vulnerability referenced as previously targeted by REvil affiliates to gain initial access.
A zero-day vulnerability in Kaseya VSA used in the 2021 supply-chain compromise to bypass authentication and gain access to VSA servers, enabling downstream ransomware deployment.
A zero-day vulnerability affecting Kaseya VSA servers that was used in the Kaseya supply-chain attack.
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.