TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based overflow

Summary

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.

Remediation

1. Inventory every TOTOLINK A950RG deployment, including staging.
2. No fixed version appears in the public sources yet. Check the references below and the vendor directly.

References

• Advisoryhttps://vuldb.com/cve/CVE-2026-121599
• Advisoryhttps://vuldb.com/submit/1022561
• Referencehttps://vuldb.com/vuln/430441
• Referencehttps://vuldb.com/vuln/430441/cti
• Referencehttps://gist.github.com/H3rmesk1t/44673654282c9b21bc8971bab7e4b8a3
• Referencehttps://www.totolink.net/