{"id":"CVE-2021-27434","aliases":["EUVD-2021-14188","GHSA-43g9-fmq9-jjpm"],"status":"published","title":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and...","description":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01741,"percentile":0.77937,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200","CWE-674"],"published":"2021-05-20T13:42:54Z","modified":"2026-06-17T03:44:51Z","products":[{"vendor":"unified-automation","product":".net_based_opc_ua_client\\/server_sdk"}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-133-04","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27434"},{"url":"https://github.com/advisories/GHSA-43g9-fmq9-jjpm"}],"sources":{"cve":[{"id":"CVE-2021-27434","description":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.","status":"published","published":"2021-05-20T13:42:54Z","modified":"2024-08-03T20:48:17.296Z","cwes":["CWE-200"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14188","description":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.","status":"published","published":"2021-05-20T13:42:54Z","modified":"2024-08-03T20:48:17Z","updated_at":"2026-11-03T03:24:49.368497Z"}],"ghsa":[{"id":"GHSA-43g9-fmq9-jjpm","title":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and...","description":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.","status":"published","published":"2022-05-24T19:02:53Z","modified":"2023-01-29T05:00:50Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-200","CWE-674"],"updated_at":"2026-11-02T14:44:40.694561Z"}],"nvd":[{"id":"CVE-2021-27434","description":"Products with Unified Automation .NET based OPC UA Client/Server SDK Bundle: Versions V3.0.7 and prior (.NET 4.5, 4.0, and 3.5 Framework versions only) are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.","status":"published","published":"2021-05-20T14:15:07.767Z","modified":"2026-06-17T03:44:51.32Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-674"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}