TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow

Summary

A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

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-2026-123961
• Advisoryhttps://vuldb.com/submit/1033753
• Referencehttps://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiBasicConfig-3f953a41781f8098a6e8d808cb1a3ffd?source=copy_link
• Referencehttps://vuldb.com/vuln/432024
• Referencehttps://vuldb.com/vuln/432024/cti
• Referencehttps://www.totolink.net/