CVE-2026-19812 | TOTOLINK A800R 4.1.2cu.5137_B20200730 product.so /cgi-bin/cstecgi.cgi UploadCustomModule File stack-based overflow

A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. It has been classified as critical. This affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component product.so. This manipulation of the argument File causes stack-based buffer overflow.

This vulnerability is tracked as CVE-2026-19812. The attack is possible to be carried out remotely. Moreover, an exploit is present.