CVE-2026-41927
High
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.
SeverityHigh
CVSS8.3
Exploit probability—
ProductWDR201A WiFi Extender
PublishedMay 4, 2026
First seenMay 4, 2026
Weakness typeCWE-121CWE-121
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender | v ≤ 1.02.0 | — |
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