TOTOLINK CA300-PoE cstecgi.cgi UploadCustomModule buffer overflow

Summary

A vulnerability was detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this issue is the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument File results in buffer overflow. The attack may be launched remotely. The exploit is now public 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-2026-124060
• Advisoryhttps://vuldb.com/submit/1033757
• Referencehttps://vuldb.com/vuln/432115
• Referencehttps://vuldb.com/vuln/432115/cti
• Referencehttps://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-UploadCustomModule-3f953a41781f803fabf6e4b901fffb1f?source=copy_link
• Referencehttps://www.totolink.net/