## CVE-2025-48804: Researchers Demonstrate BitLocker Bypass via Downgrade Attack in Under Five Minutes
Security researchers have identified a critical vulnerability affecting BitLocker encryption, demonstrating a downgrade attack that can bypass the full-disk encryption mechanism in under five minutes. The attack, documented by researchers at Intrinsec, exploits CVE-2025-48804 and targets the cryptographic downgrade pathways within BitLocker's Trusted Platform Module authentication process. Organizations relying on BitLocker as a primary endpoint protection layer face immediate scrutiny of their threat models, particularly those prioritizing physical security assumptions.

The technical core of the attack exploits how BitLocker handles TPM-based key validation during boot sequences. By intercepting or manipulating the handshake between the operating system and the TPM during authentication, an attacker with physical access can force a downgrade to a weaker cryptographic pathway, bypassing the normal PIN requirement. The method requires minimal tooling and can be executed rapidly, making it operationally viable for targeted exploitation rather than theoretical concern. The researchers note that specific firmware and configuration combinations appear more susceptible, though the underlying vulnerability spans broader Windows environments using BitLocker with TPM protection.

The implications extend across enterprise and government sectors where BitLocker deployment is mandated for compliance or data protection standards. A successful bypass could expose sensitive datasets on lost or stolen devices, undermining encryption guarantees that security policies depend upon. Security teams are advised to monitor for vendor patches addressing CVE-2025-48804 and evaluate compensating controls such as enhanced PIN complexity, external TPM usage, or supplemental full-disk encryption solutions. The discovery underscores ongoing tension between convenience-oriented TPM designs and hardened security postures in high-risk environments.
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- **Source**: r/netsec
- **Sector**: The Lab
- **Tags**: bitlocker, CVE-2025-48804, downgrade-attack, TPM, encryption-bypass
- **Credibility**: unverified
- **Published**: 2026-05-10 21:31:43
- **ID**: 81642
- **URL**: https://whisperx.ai/en/intel/81642