{"cve":"CVE-2021-28839","nvd":{"published":"2021-08-10T18:15:07.180","modified":"2026-06-17T03:46:58.197","status":"Modified","description":"Null Pointer Dereference vulnerability exists in D-Link DAP-2310 2.07.RC031, DAP-2330 1.07.RC028, DAP-2360 2.07.RC043, DAP-2553 3.06.RC027, DAP-2660 1.13.RC074, DAP-2690 3.16.RC100, DAP-2695 1.17.RC063, DAP-3320 1.01.RC014 and DAP-3662 1.01.RC022 in the upload_certificate function of sbin/httpd binary. When the binary handle the specific HTTP GET request, the strrchr in the upload_certificate function would take NULL as first argument, and incur the NULL pointer dereference vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476"],"references":["https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf","https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf","https://www.dlink.com/en/security-bulletin/","https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf","https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf"],"products":["dlink:dap-2310_firmware","dlink:dap-2330_firmware","dlink:dap-2360_firmware","dlink:dap-2553_firmware","dlink:dap-2660_firmware","dlink:dap-2690_firmware","dlink:dap-2695_firmware","dlink:dap-3320_firmware","dlink:dap-3662_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-28839","score":0.01376,"percentile":0.72048,"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."]}