Windows BitLocker Flaws Allow Security Feature Bypassed

BitLocker, Microsoft’s well-known disk encryption technology, faces new scrutiny after researchers disclosed two important vulnerabilities allowing attackers to bypass its security protections.

The flaws, tracked as CVE-2025-55333 and CVE-2025-55338, were revealed on October 14, 2025, and have prompted immediate concern for enterprise and personal device security.

BitLocker Exploit Details Surface

According to Microsoft’s disclosure, both vulnerabilities enable an unauthorized attacker with physical access to a machine to circumvent BitLocker’s device encryption.

The first flaw, CVE-2025-55333, arises from “incomplete comparison with missing factors,” related to the way BitLocker authenticates storage prior to releasing cryptographic keys.

The second, CVE-2025-55338, is due to the “missing ability to patch ROM code,” leaving devices unable to fully mitigate certain classes of hardware-level attacks.

• Both vulnerabilities carry a CVSS score of 6.1 (Important).
• Attack complexity is Low, with no privileges or user interaction required.
• Confidentiality and integrity are rated High if exploited.
• Exploitation is considered “Less Likely” and no public exploit code exists.

Although there is no evidence of public exploit code or active attacks leveraging these BitLocker flaws at this time, experts warn that determined threat actors could target lost, stolen, or poorly secured laptops and desktops that rely on BitLocker encryption.

Microsoft has rated exploitation as “less likely”, but acknowledges the security impact—confidentiality and integrity of data can both be compromised, while device availability remains unaffected.

In real-world scenarios, attackers could extract sensitive files, user credentials, or corporate data from machines thought to be protected.

This bypass risk is especially concerning for organizations with traveling staff, distributed endpoints, or legacy hardware unable to accept security updates.

Mitigation and Security Community Response

According to the report, Microsoft has acted quickly, issuing official fixes and advising customers to update affected systems as part of the October security release. The vulnerabilities were responsibly disclosed by Alon Leviev, and Netanel Ben Simon, security researchers credited by Microsoft’s STORM team.

Security experts recommend organizations review device management and endpoint protection policies, ensuring systems using BitLocker encryption are patched promptly. Physical device security should also be revisited, given the vulnerabilities only require local access to exploit.

While no exploitation has been observed in the wild, BitLocker’s critical role in protecting data means organizations cannot afford to delay remediation.

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