CVE-2026-25551

HIGH 7.8

Seagull Software BarTender Deserialization Privilege Escalation via .NET Remoting Service

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

12th

Seagull Software BarTender 2021 R1 through 12.0.1 contains an insecure deserialization vulnerability that allows low-privileged local users to escalate privileges. The DataServiceSingleton .NET Remoting endpoint is bound to localhost on TCP port 7375 via BtSystem.Service.exe, limiting the attack surface to local access only. The endpoint is configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. A low-privileged local attacker can send YSoSerial.NET-generated BinaryFormatter payloads to the localhost-bound endpoint to achieve code execution as NT AUTHORITY\\SYSTEM.

CWE	CWE-502
Vendor	seagull software, llc.
Product	bartender 2021
Published	Jun 4, 2026
Last Updated	Jun 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Seagull Software, LLC. / BarTender 2021

R1 ≤ 12.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gist.github.com: https://gist.github.com/VAMorales/dde5b1c0415a8505ccd6fafdb095a618 portal.seagullscientific.com: https://portal.seagullscientific.com/downloads/bartender vulncheck.com: https://www.vulncheck.com/advisories/seagull-software-bartender-deserialization-privilege-escalation-via-net-remoting-service

Credits

Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp. Jan A. Rodriguez, Pentester, GM Sectec, Corp. VulnCheck