TOTOLINK CA300-PoE cstecgi.cgi setLanguageCfg buffer overflow

Summary

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. The impacted element is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument langType results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may 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-2026-123959
• Advisoryhttps://vuldb.com/submit/1033721
• Referencehttps://vuldb.com/vuln/432022
• Referencehttps://vuldb.com/vuln/432022/cti
• Referencehttps://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setLanguageCfg-3f953a41781f80199f44f227136a1441?source=copy_link
• Referencehttps://www.totolink.net/