CVE-2025-59322 Overview
CVE-2025-59322 affects CPSD CryptoPro Secure Disk for Bitlocker versions prior to v7.7.4. The product fails to properly handle decryption errors and allows encrypted volumes to be mounted as plaintext. This defeats the confidentiality guarantee that full-disk encryption is expected to provide. An attacker with access to an encrypted volume may retrieve data without supplying valid credentials or a valid decryption key. The flaw was disclosed as part of Black Hat USA 2026 research on the cost of security through obscurity.
Critical Impact
Encrypted volumes protected by CryptoPro Secure Disk for Bitlocker can be mounted in plaintext, bypassing full-disk encryption and exposing all data at rest.
Affected Products
- CPSD CryptoPro Secure Disk for Bitlocker versions before v7.7.4
Discovery Timeline
- 2026-08-12 - CVE-2025-59322 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2025-59322
Vulnerability Analysis
CryptoPro Secure Disk for Bitlocker layers additional pre-boot authentication and management functionality on top of Microsoft BitLocker. The product is expected to validate decryption operations before exposing volume contents to the operating system. In versions before v7.7.4, the mount workflow does not treat decryption errors as fatal. Instead of aborting the mount and denying access, the product proceeds to expose the underlying volume as plaintext.
The outcome is a broken cryptographic control. Attackers who can present the encrypted media to a vulnerable installation gain access to sensitive data without cryptographic authentication. This is an information disclosure condition rooted in improper error handling within the encryption enforcement path.
Root Cause
The root cause is improper handling of decryption failure states in the volume mount logic. Correct behavior requires the driver or service to fail closed when a decryption operation returns an error. The affected versions instead permit the mount to continue, resulting in plaintext exposure of encrypted content. The defect combines weak cryptographic enforcement with a missing security constraint on the error path.
Attack Vector
An attacker with access to an encrypted volume mounts it on a system running a vulnerable version of CryptoPro Secure Disk for Bitlocker. The mount operation triggers a decryption error condition that the software does not correctly reject. The volume is then made available in plaintext, allowing files to be read directly. Details of the exploitation path are described in the Black Hat USA 2026 research materials.
No public proof-of-concept code is included in the CVE record. Refer to the Black Hat Presentation PDF and the Black Hat White Paper PDF for the technical walkthrough.
Detection Methods for CVE-2025-59322
Indicators of Compromise
- Installations of CPSD CryptoPro Secure Disk for Bitlocker with a version string below 7.7.4.
- Unexpected successful mounts of encrypted volumes on systems where decryption keys or credentials were not supplied by an authorized user.
- Volume access events on removable or portable encrypted media that lack a corresponding pre-boot authentication event.
Detection Strategies
- Inventory endpoints for the presence and version of CryptoPro Secure Disk for Bitlocker and flag any instance below v7.7.4.
- Correlate volume mount events with authentication events to identify mounts that did not require valid credentials.
- Monitor for driver and service errors emitted by the CryptoPro Secure Disk components that precede successful volume access.
Monitoring Recommendations
- Forward Windows system, security, and application logs from endpoints running CryptoPro Secure Disk to a centralized SIEM for correlation.
- Alert on file system access to volumes labeled or classified as encrypted when no unlock event has occurred.
- Track physical or USB-based media insertion events on systems that host the vulnerable software.
How to Mitigate CVE-2025-59322
Immediate Actions Required
- Upgrade all CryptoPro Secure Disk for Bitlocker installations to v7.7.4 or later.
- Identify and restrict use of encrypted media on endpoints that have not yet been patched.
- Review recent access logs on encrypted volumes for signs of unauthorized mounts.
Patch Information
The vendor addresses the issue in CryptoPro Secure Disk for Bitlocker v7.7.4. Refer to the CPSD Blog Post for release information and upgrade guidance.
Workarounds
- Where patching is delayed, prevent encrypted volumes from being mounted on systems running vulnerable versions of the product.
- Enforce physical security controls on devices and media protected by CryptoPro Secure Disk for Bitlocker until upgrades are complete.
- Consider reverting protected volumes to native Microsoft BitLocker management on hosts that cannot be updated promptly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
