CVE-2026-79911
CriticalCVSS 10.0Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
TOTOLINK N600R 4.3.0cu.7647_B20210106 has a stack-based buffer overflow vulnerability in the setSystemConfig function of /cgi-bin/cstecgi.cgi. Manipulation of the Hostname argument leads to buffer overflow, which can be exploited remotely. The exploit has been publicly disclosed.
Risk Assessment
Remote attack could lead to arbitrary code execution or device crash, potentially compromising network integrity.
Recommendation
Update the router firmware to the latest version if available. Restrict access to the admin panel and CGI interface to trusted networks only.
Other vulnerabilities in TOTOLINK N600R
See all- CVE-2025-51390Critical
A command injection vulnerability was discovered in the TOTOLINK N600R router running firmware version V4.3.0cu.7647_B20210106. The issue resides in the setWiFiWpsConfig function via the pin parameter.
- CVE-2025-46060Critical
A buffer overflow vulnerability was found in the TOTOLINK N600R router firmware version 4.3.0cu.7866_B2022506. A remote attacker can exploit the UPLOAD_FILENAME component to execute arbitrary code.
- CVE-2026-82555Low
Vulnerability in TOTOLINK N600R in the loginAuth function of cstecgi.cgi leads to insufficiently random values. Remote attack is possible but has high complexity and difficulty.
- CVE-2026-79912High
A vulnerability was detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The impacted element is the function getCurrentTime of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument ntp_server results in command injection. The attack can be initiated remotely. The exploit is now public and may be used.
- CVE-2025-11444High
A security vulnerability has been detected in TOTOLINK N600R up to 4.3.0cu.7866_B20220506 in the setWiFiBasicConfig function of the /cgi-bin/cstecgi.cgi file in the HTTP Request Handler component. Manipulation of the wepkey argument leads to buffer overflow. The attack can be launched remotely, and the exploit has been publicly disclosed.
Original NVD description (English source)
A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The affected element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument Hostname leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS