{"id":"CVE-2021-33266","aliases":["EUVD-2021-19977","GHSA-rx3j-3jjp-4j5v"],"status":"published","title":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to...","description":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.","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":0.16873,"percentile":0.97072,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-12-01T21:20:55Z","modified":"2026-06-17T03:54:24Z","products":[{"vendor":"dlink","product":"dir-809_firmware"}],"references":[{"url":"https://www.dlink.com/en/security-bulletin/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln04","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33266"},{"url":"https://github.com/advisories/GHSA-rx3j-3jjp-4j5v"}],"sources":{"cve":[{"id":"CVE-2021-33266","description":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.","status":"published","published":"2021-12-01T21:20:55Z","modified":"2024-08-03T23:42:20.318Z","updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-19977","description":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.","status":"published","published":"2021-12-01T21:20:55Z","modified":"2024-08-03T23:42:20Z","updated_at":"2026-11-03T03:24:34.73748Z"}],"ghsa":[{"id":"GHSA-rx3j-3jjp-4j5v","title":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to...","description":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.","status":"published","published":"2021-12-02T00:00:35Z","modified":"2023-02-01T05:06:39Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:50:23.506103Z"}],"nvd":[{"id":"CVE-2021-33266","description":"D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.","status":"published","published":"2021-12-01T22:15:07.647Z","modified":"2026-06-17T03:54:24.02Z","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":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}