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CVE-2026-9408— Totolink A8000RU Web Management cstecgi.cgi setStaticDhcpRules 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组件文件/cgi-bin/cstecgi.cgi中函数setStaticDhcpRules的参数enable操作，可能导致OS命令注入。

CVSS 9.8 · Critical EPSS 1.73% · P76

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink A8000RU 7.1cu.643_b20200521 affected
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I. Basic Information for CVE-2026-9408

Vulnerability Information
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Vulnerability Title
Totolink A8000RU Web Management cstecgi.cgi setStaticDhcpRules os command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected by this issue is the function setStaticDhcpRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument enable results in os command injection. The attack may be performed from remote. The exploit is now public and may 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组件文件/cgi-bin/cstecgi.cgi中函数setStaticDhcpRules的参数enable操作，可能导致OS命令注入。
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-2026-9408

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9527 chars
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III. Intelligence Information for CVE-2026-9408

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Other References for CVE-2026-9408 (1)

Same Patch Batch · Totolink · 2026-05-25 · 20 CVEs total

CVE-2026-9458 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setWanCfg os command injection
CVE-2026-9432 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setWiFiAdvancedCfg os command injection
CVE-2026-9433 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setMacFilterRules os command injection
CVE-2026-9434 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setWiFiWpsCfg os command injection
CVE-2026-9435 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setQosCfg os command injection
CVE-2026-9436 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setL2tpServerCfg os command injection
CVE-2026-9454 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setOpenVpnCertGenerationCfg os command injecti
CVE-2026-9455 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi UploadOpenVpnCert os command injection
CVE-2026-9456 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setOpenVpnCfg os command injection
CVE-2026-9457 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi UploadFirmwareFile os command injection
CVE-2026-9475 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setIpQosRules os command injection
CVE-2026-9476 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setPasswordCfg os command injection
CVE-2026-9477 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setAccessDeviceCfg os command injection
CVE-2026-9478 9.8 CRITICAL Totolink A8000RU Web Management cstecgi.cgi setParentalRules os command injection
CVE-2026-9515 6.3 MEDIUM Totolink CA750-PoE Setting cstecgi.cgi setUnloadUserData os command injection
CVE-2026-9511 6.3 MEDIUM Totolink CA750-PoE Setting cstecgi.cgi setWebWlanIdx os command injection
CVE-2026-9512 6.3 MEDIUM Totolink CA750-PoE Setting cstecgi.cgi setPasswordCfg os command injection
CVE-2026-9513 6.3 MEDIUM Totolink CA750-PoE Setting cstecgi.cgi NTPSyncWithHost os command injection
CVE-2026-9514 6.3 MEDIUM Totolink CA750-PoE Setting cstecgi.cgi setNetworkDiag os command injection

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-9408

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