Vulnerability Description
Seagull Software BarTender 2010, 2016, and 2019 contain an unauthenticated remote code execution vulnerability in the .NET Remoting service exposed on TCP port 7375 via BtSystem.Service.exe. The service registers an unauthenticated singleton endpoint — BarTenderSystem for BarTender 2016 <= R9, and DataServiceSingleton for BarTender 2019 <= R10 — configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling to read or write arbitrary files on the server using the .NET WebClient class, or coerce NTLMv2 authentication by supplying a UNC path to an attacker-controlled server, enabling sensitive credential disclosure, remote code execution, or lateral movement depending on service account privileges and network environment. The service runs in the context of NT AUTHORITY\SYSTEM.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://portal.seagullscientific.com/downloads/bartender
- https://www.vulncheck.com/advisories/seagull-software-bartender-unauthenticated-
FAQ
What is CVE-2026-25550?
CVE-2026-25550 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Seagull Software BarTender 2010, 2016, and 2019 contain an unauthenticated remote code execution vulnerability in the .NET Remoting service exposed on TCP port 7375 via BtSystem.Service.exe. The servi...
How severe is CVE-2026-25550?
CVE-2026-25550 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-25550?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.