Vulnerability · Published Nov 7, 2026 · Assigned by VulDB
CVE-2026-123961TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow
Critical 9.9
In plain English
A critical-severity buffer overflow in CA300-PoE from TOTOLINK. There are no confirmed reports of exploitation so far.
Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)–no EPSS score yet
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-120, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C
References
- VDB-432024 | TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow vdb-entry, technical-description
- VDB-432024 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- CVE-2026-123961 | CVE Analysis and Report third-party-advisory
- Submit #1033753 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow third-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiBasicConfig-3f953a41781f8098a6e8d808cb1a3ffd?source=copy_link exploit
- https://www.totolink.net/ product