{"id":"CVE-2021-36767","aliases":["EUVD-2021-23355","GHSA-22vf-qc4p-vc3x"],"status":"published","title":"In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that...","description":"In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.","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":"2026-11-08","score":0.00687,"percentile":0.52932,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-916"],"published":"2021-10-08T14:22:57Z","modified":"2026-06-17T03:59:08Z","products":[{"vendor":"digi","product":"6350-sr_firmware"},{"vendor":"digi","product":"cm_firmware"},{"vendor":"digi","product":"connect_es_firmware"},{"vendor":"digi","product":"connectport_lts_8\\/16\\/32_firmware"},{"vendor":"digi","product":"connectport_ts_8\\/16_firmware"},{"vendor":"digi","product":"one_ia_firmware"},{"vendor":"digi","product":"one_iap_firmware"},{"vendor":"digi","product":"one_iap_haz_firmware"},{"vendor":"digi","product":"passport_integrated_console_server_firmware"},{"vendor":"digi","product":"portserver_ts_firmware"},{"vendor":"digi","product":"portserver_ts_m_mei_firmware"},{"vendor":"digi","product":"portserver_ts_mei_firmware"},{"vendor":"digi","product":"portserver_ts_mei_hardened_firmware"},{"vendor":"digi","product":"portserver_ts_p_mei_firmware"},{"vendor":"digi","product":"realport"},{"vendor":"digi","product":"transport_wr11_xt_firmware"},{"vendor":"digi","product":"wr21_firmware"},{"vendor":"digi","product":"wr31_firmware"},{"vendor":"digi","product":"wr44_r_firmware"}],"references":[{"url":"https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txt","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36767"},{"url":"https://github.com/advisories/GHSA-22vf-qc4p-vc3x"}],"sources":{"cve":[{"id":"CVE-2021-36767","description":"In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.","status":"published","published":"2021-10-08T14:22:57Z","modified":"2024-08-04T01:01:59.227Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-23355","description":"In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.","status":"published","published":"2021-10-08T14:22:57Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-22vf-qc4p-vc3x","title":"In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that...","description":"In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.","status":"published","published":"2022-05-24T19:17:03Z","modified":"2023-01-30T05:02:45Z","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-916"],"updated_at":"2026-11-02T14:46:42.642348Z"}],"nvd":[{"id":"CVE-2021-36767","description":"In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.","status":"published","published":"2021-10-08T15:15:09.037Z","modified":"2026-06-17T03:59:08.037Z","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-916"],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}