{"id":"CVE-2021-30189","aliases":["EUVD-2021-17121","GHSA-42p7-q2xh-94rj"],"status":"published","title":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","description":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","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":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01236,"percentile":0.69301,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-05-25T12:09:10Z","modified":"2026-06-17T03:49:50Z","products":[{"vendor":"codesys","product":"v2_web_server"},{"vendor":"wago","product":"750-8202_firmware"},{"vendor":"wago","product":"750-8203_firmware"},{"vendor":"wago","product":"750-8204_firmware"},{"vendor":"wago","product":"750-8206_firmware"},{"vendor":"wago","product":"750-8207_firmware"},{"vendor":"wago","product":"750-8208_firmware"},{"vendor":"wago","product":"750-8210_firmware"},{"vendor":"wago","product":"750-8211_firmware"},{"vendor":"wago","product":"750-8212_firmware"},{"vendor":"wago","product":"750-8213_firmware"},{"vendor":"wago","product":"750-8214_firmware"},{"vendor":"wago","product":"750-8216_firmware"},{"vendor":"wago","product":"750-8217_firmware"},{"vendor":"wago","product":"750-823_firmware"},{"vendor":"wago","product":"750-829_firmware"},{"vendor":"wago","product":"750-831_firmware"},{"vendor":"wago","product":"750-832_firmware"},{"vendor":"wago","product":"750-852_firmware"},{"vendor":"wago","product":"750-862_firmware"},{"vendor":"wago","product":"750-880_firmware"},{"vendor":"wago","product":"750-881_firmware"},{"vendor":"wago","product":"750-882_firmware"},{"vendor":"wago","product":"750-885_firmware"},{"vendor":"wago","product":"750-889_firmware"},{"vendor":"wago","product":"750-890_firmware"},{"vendor":"wago","product":"750-891_firmware"},{"vendor":"wago","product":"750-893_firmware"}],"references":[{"url":"https://customers.codesys.com/index.php","tags":["x_refsource_MISC","x_transferred","Permissions Required","Vendor Advisory"]},{"url":"https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=14726\u0026token=553da5d11234bbe1ceed59969d419a71bb8c8747\u0026download=","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30189"},{"url":"https://github.com/advisories/GHSA-42p7-q2xh-94rj"}],"sources":{"cve":[{"id":"CVE-2021-30189","description":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","status":"published","published":"2021-05-25T12:09:10Z","modified":"2024-08-03T22:24:59.628Z","updated_at":"2026-11-02T14:33:02.20241Z"}],"euvd":[{"id":"EUVD-2021-17121","description":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","status":"published","published":"2021-05-25T12:09:10Z","modified":"2024-08-03T22:24:59Z","updated_at":"2026-11-03T03:24:42.963555Z"}],"ghsa":[{"id":"GHSA-42p7-q2xh-94rj","title":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","description":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","status":"published","published":"2022-05-24T19:03:15Z","modified":"2025-08-15T21:32:18Z","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"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:03:19.214105Z"}],"nvd":[{"id":"CVE-2021-30189","description":"CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.","status":"published","published":"2021-05-25T13:15:17.743Z","modified":"2026-06-17T03:49:50.607Z","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":"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-787"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}
