TOTOLINK X5000R V9.1.0cu.2415B20250515 contains a denial-of-service vulnerability in /cgi-bin/cstecgi.cgi. The CGI reads the CONTENTLENGTH environment variable and allocates memory using malloc (CONTENTLENGTH + 1) without sufficient bounds checking. When lighttpd s request size limit is not enforced, a crafted large POST request can cause memory exhaustion or a segmentation fault, leading to a crash of the management CGI and loss of availability of the web interface.

An issue in TOTOLINK X5000R V.9.1.0u.6369B20230113 allows a remote attacker to cause a denial of service via the hosttime parameter of the NTPSyncWithHost component.

TOTOLINK X5000R V9.1.0u.6118B20201102 and V9.1.0u.6369B20230113 contains a post-authentication buffer overflow via parameter sPort/ePort in the addEffect function.

TOTOLink X5000R v9.1.0cu2415B20250515 contains an OS command injection vulnerability in the setIptvCfg handler of the /usr/sbin/lighttpd executable. The vlanVidLan1 (and other vlanVidLanX) parameters are retrieved via UciGetStr and passed to the CsteSystem function without adequate validation or filtering. This allows an authenticated attacker to execute arbitrary shell commands with root privileges by injecting shell metacharacters into the affected parameters.