TI-2026-30329 Aliases CVE-2026-41927 GHSA-59q4-38q7-24rv

WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi

LOW 36CWE-121Published 2026-05-04 · Updated 2026-05-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: Low · Low · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00396 34th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Shenzhen Yipu Commercial and Trading Co., Ltd	WDR201A WiFi Extender	up to 1.02.0	—	No fix listed	CNA

WDR201A WiFi Extender VendorShenzhen Yipu Commercial and Trading Co., Ltd Affected up to 1.02.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-41927
2026-10-03 Alias added: GHSA-59q4-38q7-24rv

References

Exploit 1

https://mstreet97.github.io/security-research/iot/vulnerability-disclosure/ai-assisted-research/cybersecurity/cve/2026/05/04/Teaching_the_Machine_Where_to_Look.html

Other 1

https://www.made-in-china.com/showroom/yeapook/#:~:text=Established%20in%202015.%2CDistrict%2C%20Shenzhen%2C%20Guangdong%2C%20China

TI-2026-30328 WDR201A WiFi Extender OS Command Injection via firewall.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30327 WDR201A WiFi Extender OS Command Injection via adm.cgi (reboot_time) CVSS 4.0CRITICAL 9.3
TI-2026-30326 WDR201A WiFi Extender OS Command Injection via makeRequest.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30325 WDR201A WiFi Extender OS Command Injection via internet.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30324 WDR201A WiFi Extender OS Command Injection via wireless.cgi CVSS 4.0CRITICAL 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences