Seagull Software BarTender Deserialization Privilege Escalation via .NET Remoting Service_CVE-2026-25551

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-04T17:20:09.946Z",
    "modified": "2026-06-04T17:20:09.946Z",
    "type": "cve",
    "title": "Seagull Software BarTender Deserialization Privilege Escalation via .NET Remoting Service",
    "source": "VulnCheck",
    "references": "https://gist.github.com/VAMorales/dde5b1c0415a8505ccd6fafdb095a618\nhttps://portal.seagullscientific.com/downloads/bartender\nhttps://www.vulncheck.com/advisories/seagull-software-bartender-deserialization-privilege-escalation-via-net-remoting-service",
    "id": "CVE-2026-25551",
    "bulletinFamily": "",
    "cwe": [
        "CWE-502"
    ],
    "cvelist": null,
    "sourceData": "Seagull Software, LLC. BarTender 2021 R1",
    "sourceHref": "",
    "cvss": {
        "score": 8.5,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "BarTender 2021",
    "version": "R1",
    "vendor": "Seagull Software, LLC.",
    "ai_description": "Insecure deserialization vulnerability allowing low-privileged local users to escalate privileges via .NET Remoting Service",
    "ai_severity": "High",
    "ai_vendor": "Seagull Software, LLC.",
    "ai_product": "BarTender",
    "ai_version": "2021 R1, 12.0.1",
    "ai_score": 8.5
}