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CVE-2026-41927— WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi

Quick assessment

Affected
Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender
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.

Yeapook WDR201A WiFi Extender是Yeapook公司的一款无线信号扩展设备。 Yeapook WDR201A WiFi Extender HW V2.1版本和FW LFMZX28040922V1.02版本存在安全漏洞，该漏洞源于firewall.cgi和makeRequest.cgi二进制文件中存在基于栈的缓冲区溢出，可能导致未经身份验证的攻击者覆盖保存的返回地址。

AI Predicted 9.8 Difficulty: Easy EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender ≤ 1.02.0 affected
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I. Basic Information for CVE-2026-41927

Vulnerability Information
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Vulnerability Title
WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi
Source: CVE Program / CVE List V5
Vulnerability Description
WDR201A WiFi Extender (HW V2.1, FW LFMZX28040922V1.02) contains a stack-based buffer overflow vulnerability in the firewall.cgi and makeRequest.cgi binaries that allows unauthenticated attackers to overwrite the saved return address by sending a POST request with a Content-Length header exceeding 512 bytes. Attackers can exploit insufficient length validation in the fgets() call to achieve arbitrary code execution through return-oriented programming or return-to-libc techniques.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Yeapook WDR201A WiFi Extender 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Yeapook WDR201A WiFi Extender是Yeapook公司的一款无线信号扩展设备。 Yeapook WDR201A WiFi Extender HW V2.1版本和FW LFMZX28040922V1.02版本存在安全漏洞，该漏洞源于firewall.cgi和makeRequest.cgi二进制文件中存在基于栈的缓冲区溢出，可能导致未经身份验证的攻击者覆盖保存的返回地址。
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
Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender 0 ~ 1.02.0 -

II. Public POCs for CVE-2026-41927

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III. Intelligence Information for CVE-2026-41927

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Vendor Advisories for CVE-2026-41927 (1)

Same Patch Batch · Shenzhen Yipu Commercial and Trading Co., Ltd · 2026-05-04 · 6 CVEs total

CVE-2026-41924 WDR201A WiFi Extender OS Command Injection via makeRequest.cgi
CVE-2026-41925 WDR201A WiFi Extender OS Command Injection via adm.cgi (reboot_time)
CVE-2026-41922 WDR201A WiFi Extender OS Command Injection via wireless.cgi
CVE-2026-41926 WDR201A WiFi Extender OS Command Injection via firewall.cgi
CVE-2026-41923 WDR201A WiFi Extender OS Command Injection via internet.cgi

IV. Related Vulnerabilities

Same product: WDR201A WiFi Extender
Same vendor: Shenzhen Yipu Commercial and Trading Co., Ltd
Same weakness: CWE-121

V. Comments for CVE-2026-41927

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