CVE-2026-124059
CriticalCVSS 9.1Summary
A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. The function setWiFiWdsAddConfig in the file /cgi-bin/cstecgi.cgi is affected, where manipulation of the ApCliKeyStr argument leads to a buffer overflow. The attack may be initiated remotely, and the exploit has been disclosed publicly and may be used.
Risk Assessment
A remote attacker could exploit the buffer overflow to disrupt the device or potentially gain control over it. The public availability of the exploit increases the risk of real attacks against organizations using this model.
Recommendation
Update the TOTOLINK CA300-PoE firmware to a version free of the vulnerability or restrict access to the management interface from external networks. Until a fix is released, consider disabling or isolating affected devices.
Other vulnerabilities in TOTOLINK CA300-PoE
See all- CVE-2026-124058Critical
A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884. The function setWiFiRepeaterConfig in the file /cgi-bin/cstecgi.cgi is affected, where manipulation of the ApCliKeyStr argument can lead to a buffer overflow. The attack can be launched remotely, and the exploit has been made available to the public and could be used for attacks.
- CVE-2026-124057Critical
A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi. Manipulation of the argument Key1Str1 results in a buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
- CVE-2026-123961Critical
A vulnerability was detected in TOTOLINK CA300-PoE version 6.2c.884 affecting the setWiFiBasicConfig function in /cgi-bin/cstecgi.cgi. Manipulation of the KeyStr argument leads to a buffer overflow. The attack can be initiated remotely and a public exploit is available.
- CVE-2026-123960Critical
In TOTOLINK CA300-PoE version 6.2c.884, the setWanConfig function in /cgi-bin/cstecgi.cgi improperly handles the pppoeUser/priDns/secDns arguments, leading to a buffer overflow. The vulnerability can be exploited remotely, and a public exploit is already available.
- CVE-2026-123959Critical
In TOTOLINK CA300-PoE version 6.2c.884, the setLanguageCfg function in /cgi-bin/cstecgi.cgi improperly processes the langType argument, resulting in a buffer overflow. The attack can be initiated remotely, and the exploit has been publicly released.
- CVE-2026-123958Critical
In TOTOLINK CA300-PoE version 6.2c.884, the setLanConfig function in /cgi-bin/cstecgi.cgi mishandles the lanDns/lanSecDns/langType arguments, leading to a buffer overflow. The vulnerability can be exploited remotely, and a public exploit is already available.
- CVE-2026-123957Critical
In TOTOLINK CA300-PoE version 6.2c.884, the setIpQosRules function in /cgi-bin/cstecgi.cgi mishandles the ipStart argument, leading to a buffer overflow. The vulnerability can be exploited remotely, and the exploit has been publicly disclosed.
Original NVD description (English source)
A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this vulnerability is the function setWiFiWdsAddConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ApCliKeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS