{"id":"CVE-2021-31337","aliases":["EUVD-2021-18247","GHSA-hwxw-fmr7-f2c3"],"status":"published","title":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does...","description":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).","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":0.01678,"percentile":0.77099,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-306"],"published":"2021-06-28T12:24:58Z","modified":"2026-06-17T03:51:34Z","products":[{"vendor":"siemens","product":"sinamics_sl150_firmware"},{"vendor":"siemens","product":"sinamics_sm150_firmware"},{"vendor":"siemens","product":"sinamics_sm150i_firmware"}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04","tags":["x_refsource_MISC","x_transferred","Not Applicable","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31337"},{"url":"https://github.com/advisories/GHSA-hwxw-fmr7-f2c3"}],"sources":{"cve":[{"id":"CVE-2021-31337","description":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).","status":"published","published":"2021-06-28T12:24:58Z","modified":"2024-08-03T22:55:53.698Z","cwes":["CWE-306"],"updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18247","description":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).","status":"published","published":"2021-06-28T12:24:58Z","modified":"2024-08-03T22:55:53Z","updated_at":"2026-11-03T03:24:39.559154Z"}],"ghsa":[{"id":"GHSA-hwxw-fmr7-f2c3","title":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does...","description":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).","status":"published","published":"2022-05-24T19:06:26Z","modified":"2023-01-30T05:00:33Z","cwes":["CWE-306"],"updated_at":"2026-11-02T14:46:13.539888Z"}],"nvd":[{"id":"CVE-2021-31337","description":"The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).","status":"published","published":"2021-06-28T13:15:20.84Z","modified":"2026-06-17T03:51:34.163Z","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":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:06:55.259633Z"}]}}