{"id":"CVE-2021-28840","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-28840","generatedAt":"2026-10-27T20:20:43.620Z","title":"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…","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_config function of sbin/httpd binary. When the binary handle the specific HTTP GET request, the content in upload_file variable is NULL in the upload_config function then the strncasecmp would take NULL as first argument, and incur the NULL pointer dereference vulnerability.","published":"2021-08-10T18:15:07.000Z","lastModified":"2026-06-17T03:46:58.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["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"],"epss":{"score":0.02311,"percentile":0.83267,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.dlink.com/en/security-bulletin/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.dlink.com/en/security-bulletin/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-28840","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}