CVE-2025-34153 Hyland OnBase < 17.0.2.87 .NET Remoting TCP Channel Unauthenticated RCE
Unauthenticated attackers can execute arbitrary code with SYSTEM privileges via insecure deserialization in the .NET Remoting TCP channel.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-34153?
CVE-2025-34153 is a critical unsafe deserialization vulnerability in Hyland Software OnBase, published on 13 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2025-34153?
How do I fix CVE-2025-34153?
No fix has been published for CVE-2025-34153 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-34153 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34153 exists.
Sources
Also known as GHSA-4vjp-phjj-3f57.