CVE-2026-18607 | Wavlink NU516 up to 20260609 lighttpd upload.cgi strcpy HTTP_COOKIE stack-based overflow (EUVD-2026-52371)

A vulnerability marked as critical has been reported in Wavlink WN572, WN570H, WN573, WN529, WN530, WN531, WN535, etc. WN529, WN530, WN531, WN535, WN536, WN551, WN557 and NU516 up to 20260609. Affected by this issue is the function strcpy of the file upload.cgi of the component lighttpd. The manipulation of the argument HTTP_COOKIE leads to stack-based buffer overflow. This vulnerability is traded as CVE-2026-18607. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.