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CVE-2021-42310 is a critical vulnerability in Microsoft Defender for IoT affecting the product’s ZIP-based password recovery workflow in both cloud-connected and on-premises deployments. The recovery mechanism accepts an uploaded archive containing a signing certificate, issuer certificate, and a password reset manifest. The implementation performs validation across separate Python and Java components, introducing a time-of-check/time-of-use flaw in the recovery flow. In addition, the Java-side validation logic does not properly verify the trustworthiness of the supplied signing certificate and only checks whether the reset manifest is signed by the attached certificate, allowing use of attacker-generated self-signed material. The recovery logic also uses insufficient subscription validation, enabling bypass of authorization checks. Together, these flaws allow an unauthenticated attacker to submit a crafted recovery package and reset the password of a privileged account without authorization.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unauthenticated password recovery flaw in Microsoft Azure Defender for IoT involving a TOCTOU race condition and logic weaknesses in the password reset mechanism, allowing unauthorized password reset and compromise.
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.
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.