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CVE-2021-30116 is a critical vulnerability affecting Kaseya VSA before version 9.5.7. The issue combines an unauthenticated credential disclosure condition with a business logic flaw in the on-premises agent download workflow exposed through the default download page. When a Windows agent is downloaded and installed, agent credentials are generated and stored in a configuration file, including an agent identifier and password. Those credentials can then be used against the download functionality to authenticate as an agent and obtain a valid session cookie. Due to insufficient separation between agent-intended functionality and broader application session handling, the resulting session can be reused to bypass intended authentication boundaries and access services not meant to be available to agents. The flaw was exploited in the wild in July 2021.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 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.