CVE-2025-34153
Published: 13 August 2025
Summary
CVE-2025-34153 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Hyland OnBase (inferred from references). Its CVSS base score is 10.0 (Critical).
Operationally, ranked in the top 14.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
Hyland OnBase versions prior to 17.0.2.87 are affected by an unauthenticated remote code execution vulnerability stemming from insecure deserialization over a .NET Remoting TCP channel. The Timer Service registers a listener on TCP port 6031 exposing the TimerServer endpoint implemented in Hyland.Core.Timers.dll, which processes incoming data with the unsafe .NET BinaryFormatter without authentication or input validation.
An attacker with network access to the exposed port can send a crafted serialized object to the TimerServer endpoint, triggering deserialization that results in arbitrary code execution under the NT AUTHORITY\SYSTEM account. This grants full control over the affected system, including the ability to install programs, view or modify data, and create new accounts.
Hyland has published security bulletin OB2025-02 advising customers to upgrade to the fixed release 17.0.2.87 or later, with additional guidance available in the associated support documentation and the VulnCheck advisory. The EPSS score remains flat at 0.0258 with no material increase observed since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-24595
Vulnerability details
Hyland OnBase versions prior to 17.0.2.87 (other versions may be affected) are vulnerable to unauthenticated remote code execution via insecure deserialization on the .NET Remoting TCP channel. The service registers a listener on port 6031 with the URI endpoint TimerServer,…
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implemented in Hyland.Core.Timers.dll. This endpoint deserializes untrusted input using the .NET BinaryFormatter, allowing attackers to execute arbitrary code under the context of NT AUTHORITY\SYSTEM.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.