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CVE-2025-21213 is a Secure Boot security feature bypass in the Windows boot chain, described as a second variant of the Break Out in Hives technique. The issue affects the handling of boot-time trust when older vulnerable Winload versions can be introduced through a downgrade-style attack. In this scenario, an attacker leverages a previously vulnerable boot component to bypass intended Secure Boot protections and regain access to behavior that should no longer be permitted in fully updated systems. The vulnerability is associated with exploitation of the SystemDataDevice element in the boot environment and relies on the ability to boot a vulnerable Winload despite the presence of newer fixes. The result is a bypass of boot integrity assumptions that protect BitLocker-sealed systems during early boot.
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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.
1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.