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CVE-2026-9404— Totolink A8000RU Web Management cstecgi.cgi setDdnsCfg os command injection

Quick assessment

Affected
Totolink A8000RU
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.

TOTOLINK A8000RU是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A8000RU 7.1cu.643_b20200521版本存在操作系统命令注入漏洞，该漏洞源于Web Management Interface组件中/cgi-bin/cstecgi.cgi文件的setDdnsCfg函数对参数provider操作不当，可能导致os命令注入，攻击者可远程发起攻击。

CVSS 9.8 · Critical EPSS 3.25% · P88

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink A8000RU 7.1cu.643_b20200521 affected
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I. Basic Information for CVE-2026-9404

Vulnerability Information
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Vulnerability Title
Totolink A8000RU Web Management cstecgi.cgi setDdnsCfg os command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK A8000RU 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A8000RU是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A8000RU 7.1cu.643_b20200521版本存在操作系统命令注入漏洞，该漏洞源于Web Management Interface组件中/cgi-bin/cstecgi.cgi文件的setDdnsCfg函数对参数provider操作不当，可能导致os命令注入，攻击者可远程发起攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Totolink A8000RU 7.1cu.643_b20200521 cpe:2.3:o:totolink:a8000ru_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9404

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7278 chars
Pro+ exclusive includes:
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III. Intelligence Information for CVE-2026-9404

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Other References for CVE-2026-9404 (1)

Same Patch Batch · Totolink · 2026-05-24 · 9 CVEs total

CVE-2026-9407 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setFirewallType os command injection
CVE-2026-9406 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setRemoteCfg os command injection
CVE-2026-9405 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setGameSpeedCfg os command injection
CVE-2026-9388 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setScheduleCfg os command injection
CVE-2026-9387 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection
CVE-2026-9386 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setLanguageCfg os command injection
CVE-2026-9385 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setTracerouteCfg os command injection
CVE-2026-9384 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setDiagnosisCfg os command injection

IV. Related Vulnerabilities

Same product: A8000RU
Same vendor: Totolink
Same weakness: CWE-78

V. Comments for CVE-2026-9404

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