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CVE-2025-48818 is a Windows BitLocker security feature bypass vulnerability in the Windows Recovery Environment (WinRE) exploitation path, caused by a time-of-check time-of-use race/logic flaw in Boot Configuration Data (BCD) parsing and target OS selection. During BitLocker auto-unlock in WinRE, the platform could search available volumes for a BCD store and use the first matching store it found to determine the target operating system location. Because WinRE could inspect the recovery volume before the EFI volume, an attacker with physical access could place an attacker-controlled BCD store on the recovery volume and cause WinRE to trust attacker-influenced recovery configuration while the normal boot phase still relied on the legitimate EFI BCD store. Microsoft’s research indicates this behavior could be chained with Online Push Button Reset (PBR), ReAgent.xml scheduled operations, and a ResetSession.xml DecryptVolume directive to instruct recovery components to decrypt the BitLocker-protected operating system volume. The issue was addressed in Microsoft’s July 2025 Patch Tuesday release.
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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.
If you can’t patch tonight, do this now.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of four BitUnlocker WinRE zero-days enabling recovery-environment abuse against BitLocker-protected systems.
A BitLocker security feature bypass vulnerability by targeting Boot Configuration Data (BCD) parsing, allowing attackers with physical access to bypass BitLocker protections.
A WinRE Boot Configuration Data (BCD) parsing logical vulnerability that lets an attacker supply a malicious BCD store from the recovery volume and chain it with Online PBR to decrypt a BitLocker-protected OS volume.
A BitLocker security feature bypass vulnerability identified as more likely to be exploited.
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.