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CVE-2026-7823— Totolink A8000RU cstecgi.cgi setAppFilterCfg os command injection

Quick assessment

Affected
Totolink A8000RU
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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版本存在命令注入漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中函数setAppFilterCfg对参数enable的操作，可能导致os命令注入。

CVSS 9.8 · Critical EPSS 1.79% · P77

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-2026-7823

Vulnerability Information
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Vulnerability Title
Totolink A8000RU cstecgi.cgi setAppFilterCfg os command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function setAppFilterCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument enable results in os command injection. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.
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 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版本存在命令注入漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中函数setAppFilterCfg对参数enable的操作，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)

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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-2026-7823

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III. Intelligence Information for CVE-2026-7823

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Other References for CVE-2026-7823 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-7823

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