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WDR201A WiFi Extender EUVD-2026-27127

| CVE-2026-41927 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-05-04 VulnCheck
RCE Buffer Overflow Stack Overflow
8.3
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
May 04, 2026 - 20:30 vuln.today
CVSS changed
May 04, 2026 - 20:22 NVD
8.3 (HIGH)

DescriptionNVD

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.

AnalysisAI

Stack-based buffer overflow in WDR201A WiFi Extender firewall.cgi and makeRequest.cgi binaries enables remote unauthenticated attackers to execute arbitrary code through crafted POST requests with oversized Content-Length headers. The vulnerability affects hardware version 2.1 running firmware LFMZX28040922V1.02, with publicly available proof-of-concept exploit code documented via AI-assisted vulnerability research. …

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RemediationAI

Within 24 hours: Identify and inventory all WDR201A devices (hardware v2.1, firmware LFMZX28040922V1.02) across corporate networks using network scanning tools; isolate confirmed devices to a quarantine VLAN or disconnect until remediation is possible. Within 7 days: Contact TP-Link support to confirm firmware update availability beyond LFMZX28040922V1.02; if no patch is available, evaluate replacement with vendor-patched models or alternative WiFi extender solutions meeting security requirements. …

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EUVD-2026-27127 vulnerability details – vuln.today
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