CVE-2026-19811

A security flaw has been discovered in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setWiFiWpsConfig of the file /cgi-bin/cstecgi.cgi of the component wps.so. The manipulation of the argument pin results in stack-based buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks.

A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument url leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might be used.

TOTOLINK A800R version 4.1.2cu.5137_B20200730 has a stack-based buffer overflow vulnerability in the setStaticDhcpConfig function of /cgi-bin/cstecgi.cgi (component lan.so). Manipulation of the Comment argument can lead to remote code execution.

TOTOLINK A800R version 4.1.2cu.5137_B20200730 has a stack-based buffer overflow vulnerability in the setRadvdCfg function of /cgi-bin/cstecgi.cgi (component ipv6.so). Manipulation of the radvdinterfacename argument can lead to remote code execution.

A stack-based buffer overflow vulnerability was found in the TOTOLINK A800R router version 4.1.2cu.5137_B20200730 in the setParentalRules function in the file /cgi-bin/cstecgi.cgi of the firewall.so component. Manipulating the urlKeyword argument can lead to a stack-based buffer overflow. The attack can be launched remotely, and the exploit has been published.

A stack-based buffer overflow vulnerability was found in the TOTOLINK A800R router version 4.1.2cu.5137_B20200730 in the setMacQos function in the file /cgi-bin/cstecgi.cgi of the firewall.so component. Manipulating the macAddress argument can lead to a stack-based buffer overflow. The attack can be initiated remotely, and the exploit is now public.

A stack-based buffer overflow vulnerability was found in the TOTOLINK A800R router version 4.1.2cu.5137_B20200730 in the setMacFilterRules function in the file /cgi-bin/cstecgi.cgi of the firewall.so component. Manipulating the Comment argument can lead to a stack-based buffer overflow. The attack can be performed remotely, and the exploit has been publicly disclosed.

A stack-based buffer overflow vulnerability was found in the TOTOLINK A800R router version 4.1.2cu.5137_B20200730 in the UploadCustomModule function in the file /cgi-bin/cstecgi.cgi of the product.so component. Manipulating the File argument can lead to a stack-based buffer overflow. The attack can be carried out remotely, and the exploit has been made public.