{"id":"CVE-2021-27705","aliases":["EUVD-2021-14447","GHSA-ffgg-83p3-wqxr"],"status":"published","title":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote...","description":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit.","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":"2026-11-09","score":0.02943,"percentile":0.87234,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2021-04-14T14:52:09Z","modified":"2026-06-17T03:45:21Z","products":[{"vendor":"tenda","product":"g1_firmware"},{"vendor":"tenda","product":"g3_firmware"}],"references":[{"url":"https://hackmd.io/Zb7lfFaNR0ScpaTssECFbg","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27705"},{"url":"https://github.com/advisories/GHSA-ffgg-83p3-wqxr"}],"sources":{"cve":[{"id":"CVE-2021-27705","description":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit.","status":"published","published":"2021-04-14T14:52:09Z","modified":"2024-08-03T21:26:10.726Z","updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14447","description":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit.","status":"published","published":"2021-04-14T14:52:09Z","modified":"2024-08-03T21:26:10Z","updated_at":"2026-11-03T03:24:48.366655Z"}],"ghsa":[{"id":"GHSA-ffgg-83p3-wqxr","title":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote...","description":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit.","status":"published","published":"2022-05-24T17:47:36Z","modified":"2023-01-29T05:06:24Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:46:01.014857Z"}],"nvd":[{"id":"CVE-2021-27705","description":"Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit.","status":"published","published":"2021-04-14T15:15:13.97Z","modified":"2026-06-17T03:45:21.953Z","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-120"],"updated_at":"2026-11-02T14:06:51.610648Z"}]}}