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CVE-2021-42311 is an SQL injection vulnerability in Microsoft Defender for IoT affecting the update-handshake flow. The flaw is present in the UpdateHandshakeHandlers::is_connected function, which processes input associated with the token update-handshake endpoint. The vulnerable endpoint is reachable without prior authentication if the requester can supply the required update-handshake secret. Reported analysis indicates that this secret was hardcoded in product configuration and shared across installations, materially weakening access control to the endpoint. The vulnerable SQL execution path permits injection into backend database queries, enabling attacker-controlled SQL statements to be executed by the application. Because the issue resides in a network-reachable management interface component, successful exploitation can lead to compromise of application data and facilitate broader takeover of the Defender for IoT appliance.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A SQL injection vulnerability in Microsoft Azure Defender for IoT's update-handshake functionality, exploitable because the required update token is hardcoded and shared across installations, enabling unauthenticated session extraction and account takeover.
A remote code execution vulnerability in Microsoft Defender for IoT.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.