CVE-2021-28840: D-Link Dap-2310 Firmware

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

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.

Affected products

• D-Link Dap-2310 Firmware: version 2.0.7.rc031 only
• D-Link Dap-2330 Firmware: version 1.07.rc028 only
• D-Link Dap-2360 Firmware: version 2.07.rc043 only
• D-Link Dap-2553 Firmware: version 3.06.rc027 only
• D-Link Dap-2660 Firmware: version 1.13.rc074 only
• D-Link Dap-2690 Firmware: version 3.16.rc100 only
• D-Link Dap-2695 Firmware: version 1.17.rc063 only
• D-Link Dap-3320 Firmware: version 1.01.rc014 only
• D-Link Dap-3662 Firmware: version 1.01.rc022 only

Published 2021-08-10. Last modified 2026-06-17.