{"id":"CVE-2021-26637","aliases":["EUVD-2021-13431","GHSA-4j8v-2qmr-6m8p"],"status":"published","title":"SiHAS Improper Authentication vulnerability","description":"There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01915,"percentile":0.7999,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287","CWE-306","CWE-862"],"published":"2022-06-22T13:55:58Z","modified":"2026-06-17T03:43:36Z","products":[{"vendor":"shina system co.,ltd","product":"sihas firmware"},{"vendor":"shina system co.,ltd","product":"sihas old app"},{"vendor":"shinasys","product":"sihas_acm-300_firmware"},{"vendor":"shinasys","product":"sihas_gcm-300_firmware"},{"vendor":"shinasys","product":"sihas_sgw-300_firmware"}],"references":[{"url":"https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66782","tags":["x_refsource_MISC","x_transferred","Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26637"},{"url":"https://github.com/advisories/GHSA-4j8v-2qmr-6m8p"}],"sources":{"cve":[{"id":"CVE-2021-26637","title":"SiHAS Improper Authentication vulnerability","description":"There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.","status":"published","published":"2022-06-22T13:55:58Z","modified":"2024-08-03T20:26:25.557Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-13431","description":"There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.","status":"published","published":"2022-06-22T13:55:58Z","modified":"2024-08-03T20:26:25Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:24:51.40664Z"}],"ghsa":[{"id":"GHSA-4j8v-2qmr-6m8p","title":"There is no account authentication and permission check logic in the firmware and existing apps...","description":"There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.","status":"published","published":"2022-06-24T00:00:29Z","modified":"2023-07-04T05:01:44Z","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-287","CWE-306"],"updated_at":"2026-11-02T14:54:40.485503Z"}],"nvd":[{"id":"CVE-2021-26637","description":"There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.","status":"published","published":"2022-06-23T17:15:11.223Z","modified":"2026-06-17T03:43:36.447Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","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-287","CWE-306","CWE-862"],"updated_at":"2026-11-02T14:07:06.501652Z"}]}}