{"cve":"CVE-2021-39510","nvd":{"published":"2021-08-24T19:15:33.010","modified":"2026-06-17T04:03:44.287","status":"Modified","description":"An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-77"],"references":["https://github.com/doudoudedi/main-DIR-816_A1_Command-injection","https://github.com/doudoudedi/main-DIR-816_A1_Command-injection/blob/main/injection_A1.md","https://www.dlink.com/en/security-bulletin/","https://github.com/doudoudedi/main-DIR-816_A1_Command-injection","https://github.com/doudoudedi/main-DIR-816_A1_Command-injection/blob/main/injection_A1.md"],"products":["dlink:dir-816_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-39510","score":0.08624,"percentile":0.95098,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}