CVE-2025-34153

critical

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.

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://www.vulncheck.com/advisories/hyland-onbase-net-remoting-tcp-channel-unauthenticated-rce

https://www.hyland.com/en/internal/onbase-unity-client

https://support.hyland.com/r/OnBase/WorkView/Foundation-24.1/WorkView/Installation/Upgrade-Considerations/Upgrading-to-OnBase-Version-Foundation-24.1

Details

Source: Mitre, NVD

Published: 2025-08-13

Updated: 2026-02-13

Risk Information

CVSS v2

Base Score: 9.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 10

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Severity: Critical

EPSS

EPSS: 0.0033