Quick answers
- Is CVE-2026-79911 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-79911 being exploited in the wild.
- How severe is CVE-2026-79911?
- Critical severity, with a CVSS score of 10, published 25 August 2026.
- Which products and versions are affected?
- TOTOLINK N600r 4.3.0cu.7647_B20210106.
- Is there a fix for CVE-2026-79911?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-79911 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-79911?
- Check whether you run TOTOLINK N600r at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a stack-based buffer overflow in the setSystemConfig function of the CGI handler (/cgi-bin/cstecgi.cgi) in TOTOLINK N600R firmware version 4.3.0cu.7647_B20210106. The vulnerable code does not properly validate the length of the Hostname argument before copying it into a fixed-size stack buffer, allowing an attacker to overflow the buffer. The attack requires network access to the router's web interface and can be executed without authentication. A successful exploit allows remote code execution with the privileges of the CGI process, potentially leading to complete device compromise.
Affected products
- TOTOLINK N600R 4.3.0cu.7647_B20210106
Timeline
- 2026-08-25: disclosed: Vulnerability publicly disclosed
- 2026-08-25: other: Exploit code publicly available on GitHub