{"id":"CVE-2020-24683","aliases":["EUVD-2020-17397","GHSA-r3q7-7pwq-hqq8"],"status":"published","title":"Authentication Bypass in Symphony Plus","description":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01479,"percentile":0.74236,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-305","CWE-602","CWE-669"],"published":"2020-12-22T21:19:10Z","modified":"2026-06-17T03:05:58Z","products":[{"vendor":"abb","product":"abb ability™ symphony® plus operations"},{"vendor":"abb","product":"symphony_\\+_historian"},{"vendor":"abb","product":"symphony_\\+_operations"}],"references":[{"url":"https://search.abb.com/library/Download.aspx?DocumentID=2PAA123980\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch","tags":["x_refsource_MISC","x_transferred","Mitigation","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24683"},{"url":"https://github.com/advisories/GHSA-r3q7-7pwq-hqq8"}],"sources":{"cve":[{"id":"CVE-2020-24683","title":"Authentication Bypass in Symphony Plus","description":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.","status":"published","published":"2020-12-22T21:19:10.709Z","modified":"2024-09-17T01:36:41.524Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-602","CWE-305"],"updated_at":"2026-11-02T14:35:54.468882Z"}],"euvd":[{"id":"EUVD-2020-17397","description":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.","status":"published","published":"2020-12-22T21:19:10Z","modified":"2024-09-17T01:36:41Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:28:47.904483Z"}],"ghsa":[{"id":"GHSA-r3q7-7pwq-hqq8","title":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user...","description":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.","status":"published","published":"2022-05-24T17:37:03Z","modified":"2023-01-29T05:05:48Z","cwes":["CWE-669"],"updated_at":"2026-11-02T14:45:52.819939Z"}],"nvd":[{"id":"CVE-2020-24683","description":"The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which relies on validation at the client node (client-side authentication). This is not as secure as having the server validate a client application before allowing a connection. Therefore, if the network communication or endpoints for these applications are not protected, unauthorized actors can bypass authentication and make unauthorized connections to the server application.","status":"published","published":"2020-12-22T22:15:13.757Z","modified":"2026-06-17T03:05:58.96Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-305","CWE-602","CWE-669"],"updated_at":"2026-11-02T14:06:27.73474Z"}]}}