CVE-2026-121599
CriticalCVSS 9.9Summary
A vulnerability was detected in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the setWiFiMultipleConfig/delWiFiMultipleConfig functions of /cgi-bin/cstecgi.cgi handling Multi-SSID configuration. Manipulating the wepkey2/wepkey3 arguments results in a stack-based buffer overflow. The attack can be launched remotely and the exploit is now public.
Risk Assessment
A stack-based buffer overflow may lead to remote code execution or device instability. Public availability of the exploit increases the risk of abuse.
Recommendation
Update the router firmware to a patched version or restrict access to the management interface. Until patched, consider disabling the Multi-SSID feature if unused.
Other vulnerabilities in TOTOLINK A950RG Firmware
See all- CVE-2026-121600Critical
A vulnerability was found in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the setMacFilterRules function of /cgi-bin/cstecgi.cgi handling MAC filtering. Manipulating the addEffect argument causes a stack-based buffer overflow. The attack can be initiated remotely and the exploit is publicly available.
- CVE-2026-121598Critical
A security vulnerability was detected in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the strcpy function of /cgi-bin/cstecgi.cgi handling basic wireless configuration. Manipulating the wepkey argument leads to a stack-based buffer overflow. The attack can be initiated remotely and the exploit has been publicly disclosed.
Original NVD description (English source)
A vulnerability was detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected is the function setWiFiMultipleConfig/delWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi of the component Multi-SSID Configuration. The manipulation of the argument wepkey2/wepkey3 results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is now public and may be used.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS