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CVE-2026-79911— TOTOLINK N600R CGI cstecgi.cgi setSystemConfig stack-based overflow

Quick assessment

Affected
TOTOLINK N600R
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在TOTOLINK N600R 4.3.0cu.7647_B20210106版本中检测到一处安全漏洞。受影响的元素是CGI Handler组件中文件/cgi-bin/cstecgi.cgi中的setSystemConfig函数。对参数Hostname的此类操纵会导致基于栈的缓冲区溢出。该漏洞可以远程利用。相关利用代码已公开披露，可能被攻击者使用。

CVSS 10.0 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-79911

Vulnerability Information
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Vulnerability Title
TOTOLINK N600R CGI cstecgi.cgi setSystemConfig stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TOTOLINK N600R 4.3.0cu.7647_B20210106 cpe:2.3:o:totolink:n600r_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-79911

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7709 chars
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III. Intelligence Information for CVE-2026-79911

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Vendor Advisories for CVE-2026-79911 (1)

Proof of Concept for CVE-2026-79911 (2)

News Coverage for CVE-2026-79911 (1)

IV. Related Vulnerabilities

Same product: N600R
Same vendor: TOTOLINK
Same weakness: CWE-121

V. Comments for CVE-2026-79911

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