CVE-2026-25551
Seagull Software BarTender Deserialization Privilege Escalation via .NET Remoting Service
Vexday Risk Score
41Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 8.5EPSS 0.1%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
04 Jun 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Seagull Software, LLC. · BarTender 2021public PoCs found — 1
cve_referencegist.github.com/VAMorales/dde5b1c0415a8505ccd6fafdb095a618unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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