CVE-2026-41927

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.

CVSS v4.0

8.3 HIGHCVSS: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

EPSS

0.40% chance of exploitation in the next 30 days, 33th percentile

Published

2026-05-04

Updated

2026-05-11

Proof-of-concept exploits (1)

• https://mstreet97.github.io/security-research/iot/vulnerability-disclosure/ai-assisted-re…

References

• CVE Record
• NVD entry

Related

• CVE-2026-41926
• CVE-2026-4193
• CVE-2026-41925
• CVE-2026-41939
• CVE-2026-41924
• CVE-2026-4194