TOTOLINK CA300-PoE cstecgi.cgi setWanConfig buffer overflow

Summary

A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884. This affects the function setWanConfig of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument pppoeUser/priDns/secDns can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.

Remediation

1. Inventory every TOTOLINK CA300-PoE 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-2026-123960
• Advisoryhttps://vuldb.com/submit/1033722
• Referencehttps://vuldb.com/vuln/432023
• Referencehttps://vuldb.com/vuln/432023/cti
• Referencehttps://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWanConfig-3f953a41781f80ec86f3c2840cb5fc4b?source=copy_link
• Referencehttps://www.totolink.net/