{"id":"CVE-2021-37273","aliases":["EUVD-2021-23845","GHSA-gq9p-fgf8-xxr3"],"status":"published","title":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON...","description":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of \"Optical Modem Smart Router.\" Attackers can use this vulnerability to restart the device multiple times.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00978,"percentile":0.62657,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-09-28T18:00:01Z","modified":"2026-06-17T04:00:19Z","products":[{"vendor":"chinatelecom","product":"epon_tianyi_gateway_zxhn_f450_firmware"}],"references":[{"url":"https://www.cnvd.org.cn/flaw/show/2958526","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37273"},{"url":"https://github.com/advisories/GHSA-gq9p-fgf8-xxr3"}],"sources":{"cve":[{"id":"CVE-2021-37273","description":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of \"Optical Modem Smart Router.\" Attackers can use this vulnerability to restart the device multiple times.","status":"published","published":"2021-09-28T18:00:01Z","modified":"2024-08-04T01:16:04.017Z","updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-23845","description":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of \"Optical Modem Smart Router.\" Attackers can use this vulnerability to restart the device multiple times.","status":"published","published":"2021-09-28T18:00:01Z","modified":"2024-08-04T01:16:04Z","updated_at":"2026-11-03T03:24:27.725787Z"}],"ghsa":[{"id":"GHSA-gq9p-fgf8-xxr3","title":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON...","description":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of \"Optical Modem Smart Router.\" Attackers can use this vulnerability to restart the device multiple times.","status":"published","published":"2022-05-24T19:15:57Z","modified":"2023-01-30T05:02:28Z","updated_at":"2026-11-02T14:46:38.945282Z"}],"nvd":[{"id":"CVE-2021-37273","description":"A Denial of Service issue exists in China Telecom Corporation EPON Tianyi Gateway ZXHN F450(EPON ONU) 3.0. Tianyi Gateway is a hardware terminal of \"Optical Modem Smart Router.\" Attackers can use this vulnerability to restart the device multiple times.","status":"published","published":"2021-09-28T18:15:08.793Z","modified":"2026-06-17T04:00:19.837Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:59.314106Z"}]}}