{"id":"CVE-2021-37909","aliases":["EUVD-2021-24387","GHSA-7wg8-6xc4-8gfw"],"status":"published","title":"CHANGING Inc. TSSServiSignAdapter Windows Versions - Improper Input Validation","description":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.","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":"2026-11-10","score":0.02007,"percentile":0.80995,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2021-09-15T19:10:22Z","modified":"2026-06-17T04:01:13Z","products":[{"vendor":"changing inc.","product":"tssservisignadapter"},{"vendor":"tssservisignadapter_project","product":"tssservisignadapter"}],"references":[{"url":"https://www.twcert.org.tw/tw/cp-132-5093-76f04-1.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37909"},{"url":"https://github.com/advisories/GHSA-7wg8-6xc4-8gfw"}],"sources":{"cve":[{"id":"CVE-2021-37909","title":"CHANGING Inc. TSSServiSignAdapter Windows Versions - Improper Input Validation","description":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.","status":"published","published":"2021-09-15T19:10:22.691Z","modified":"2024-09-17T00:42:01.361Z","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-20"],"updated_at":"2026-11-02T14:32:58.359368Z"}],"euvd":[{"id":"EUVD-2021-24387","description":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.","status":"published","published":"2021-09-15T19:10:22Z","modified":"2024-09-17T00:42:01Z","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":"2026-11-03T00:28:56.465986Z"}],"ghsa":[{"id":"GHSA-7wg8-6xc4-8gfw","title":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote...","description":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.","status":"published","published":"2022-05-24T22:28:24Z","modified":"2023-01-30T05:05:00Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:47:10.51539Z"}],"nvd":[{"id":"CVE-2021-37909","description":"WriteRegistry function in TSSServiSign component does not filter and verify users’ input, remote attackers can rewrite to the registry without permissions thus perform hijack attacks to execute arbitrary code.","status":"published","published":"2021-09-15T19:15:09.873Z","modified":"2026-06-17T04:01:13.93Z","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":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:06:58.502206Z"}]}}