TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig stack-based overflow

Summary

A weakness has been identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This affects the function setAppEasyWizardConfig of the file /cgi-bin/cstecgi.cgi of the component Easy Setup Wizard Handler. Executing a manipulation of the argument functionType can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

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-2026-121597
• Advisoryhttps://vuldb.com/submit/1022558
• Referencehttps://vuldb.com/vuln/430439
• Referencehttps://vuldb.com/vuln/430439/cti
• Referencehttps://gist.github.com/H3rmesk1t/49d6ccded59379651568e0bdc6b5624c
• Referencehttps://www.totolink.net/