What’s Vulnerable › Vulnerabilities

CVE-2025-34153: Hyland OnBase < 17.0.2.87 .NET Remoting TCP Channel Unauthenticated RCE

• Severity: critical (CVSS 10.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-13 · updated 2026-06-17
• Weakness: CWE-502

Description

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, 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.

Affected products

• Hyland Software OnBase: before 17.0.2.87 — fixed in 17.0.2.87

How to fix

Upgrade to a fixed version: Hyland Software OnBase 17.0.2.87. Check the vendor advisory for mitigations.

References

• https://community.hyland.com/resources/bulletins-and-notices/210540-security-update-hyland-timer-service-bulletin-ob2025-02
• https://gist.github.com/VAMorales/32794cccc2195a935623a12ef32760dc
• https://support.hyland.com/r/OnBase/WorkView/Foundation-24.1/WorkView/Installation/Upgrade-Considerations/Upgrading-to-OnBase-Version-Foundation-24.1
• https://www.hyland.com/en/internal/onbase-unity-client
• https://www.vulncheck.com/advisories/hyland-onbase-net-remoting-tcp-channel-unauthenticated-rce

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