CVE-2022-37134: Improper Validation of Specified Quantity in Input

D-link DIR-816 A2v1.10CNB04.img is vulnerable to Buffer Overflow via /goform/form2Wan.cgi. When wantype is 3, l2tpusrname will be decrypted by base64, and the result will be stored in v94, which does not check the size of l2tpusrname, resulting in stack overflow...