A stack-based buffer overflow exists in the getmergeipaddr function of the httpd binary on Linksys E1200 v2 routers (Firmware E1200v2.0.11.001us.tar.gz). The function concatenates up to four user-supplied CGI parameters matching <parameter>0~3 into a fixed-size buffer (a2) without bounds checking. Remote attackers can exploit this vulnerability via specially crafted HTTP requests to execute arbitrary code or cause denial of service without authentication.