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CVE-2026-7538— Totolink A8000RU CGI cstecgi.cgi vulnerability 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版本存在命令注入漏洞，该漏洞源于CGI Handler组件文件/cgi-bin/cstecgi.cgi中未知功能对参数proto的操作，可能导致OS命令注入。

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-2026-7538

Vulnerability Information
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Vulnerability Title
Totolink A8000RU CGI cstecgi.cgi vulnerability os command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function Vulnerability of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument proto leads to os command injection. The attack may be initiated 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 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CGI Handler组件文件/cgi-bin/cstecgi.cgi中未知功能对参数proto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-2026-7538

# POC Description Source Link Shenlong Link
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Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 3520 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-7538

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Proof of Concept for CVE-2026-7538 (1)

Same Patch Batch · Totolink · 2026-05-01 · 3 CVEs total

CVE-2026-7546 9.8 CRITICAL Totolink NR1800X lighttpd find_host_ip stack-based overflow
CVE-2026-7548 8.8 HIGH Totolink NR1800X cstecgi.cgi sub_41A68C command injection

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-7538

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