Stack-Based Buffer Overflow Vulnerability in WDR201A WiFi Extender by Yeapook
CVE-2026-41927

8.3HIGH

Key Information:

Vendor

Shenzhen Yipu Commercial And Trading Co., Ltd

Status
Wdr201a Wifi Extender
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-41927?

The WDR201A WiFi Extender suffers from a stack-based buffer overflow vulnerability found in the firewall.cgi and makeRequest.cgi binaries. This flaw allows unauthenticated attackers to send specially crafted POST requests with a Content-Length header exceeding 512 bytes, leading to the potential overwriting of the saved return address. The vulnerability arises from inadequate length validation in the fgets() function, creating an opportunity for attackers to execute arbitrary code via return-oriented programming or return-to-libc techniques.

Affected Version(s)

WDR201A WiFi Extender 0 <= 1.02

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-41927 - Proof of Concept

References

https://mstreet97.github.io/security-research/iot/vulnera...
technical-descriptionexploit
https://www.made-in-china.com/showroom/yeapook/#:~:text=E...
product
https://www.vulncheck.com/advisories/wdr201a-wifi-extende...
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Daniele Berardinelli
Matteo Strada
.