Vulnerability · Published Aug 13, 2025 · Assigned by VulnCheck

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

Critical 10.0

In plain English

A critical-severity unsafe deserialization in OnBase from Hyland Software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 4.0)10.0Critical

Exploit odds (30 days)0.7%top 46.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Hyland Software	OnBase	0 – before 17.0.2.87

Weakness: CWE-502 · 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

References

https://gist.github.com/VAMorales/32794cccc2195a935623a12ef32760dc technical-description, exploit
https://www.hyland.com/en/internal/onbase-unity-client product
https://support.hyland.com/r/OnBase/WorkView/Foundation-24.1/WorkView/Installation/Upgrade-Considerations/Upgrading-to-OnBase-Version-Foundation-24.1 patch
https://www.vulncheck.com/advisories/hyland-onbase-net-remoting-tcp-channel-unauthenticated-rce third-party-advisory
https://community.hyland.com/resources/bulletins-and-notices/210540-security-update-hyland-timer-service-bulletin-ob2025-02 vendor-advisory, mitigation, permissions-required