{"id":"CVE-2011-4871","aliases":["EUVD-2011-4788","GHSA-36g6-rvvm-6jhh"],"status":"published","title":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of...","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.03123,"percentile":0.87925,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-20"],"published":"2012-04-18T10:00:00Z","modified":"2026-06-16T23:35:33Z","exploits":[{"source":"exploitdb","id":"EDB-17965","title":"OPC Systems.NET 4.00.0048 - Denial of Service","type":"dos","platform":"windows","date":"2011-10-10","verified":true,"url":"https://www.exploit-db.com/exploits/17965"}],"products":[{"vendor":"opcsystems","product":"opcsystems.net"}],"references":[{"url":"http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf","tags":["x_refsource_MISC","x_transferred","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4871"},{"url":"https://github.com/advisories/GHSA-36g6-rvvm-6jhh"}],"sources":{"cve":[{"id":"CVE-2011-4871","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","status":"published","published":"2012-04-18T10:00:00Z","modified":"2024-09-16T16:37:50.419Z","updated_at":"2026-11-02T14:35:37.989579Z"}],"euvd":[{"id":"EUVD-2011-4788","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","status":"published","published":"2012-04-18T10:00:00Z","modified":"2024-09-16T16:37:50Z","updated_at":"2026-11-03T00:55:50.035364Z"}],"ghsa":[{"id":"GHSA-36g6-rvvm-6jhh","title":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of...","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","status":"published","published":"2022-05-17T05:30:47Z","modified":"2023-01-28T05:04:22Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:44:09.520474Z"}],"nvd":[{"id":"CVE-2011-4871","description":"Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.","status":"published","published":"2012-04-18T10:33:31.107Z","modified":"2026-06-16T23:35:33.017Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:02:12.272092Z"}]}}