CVE-2026-41927

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

8.3 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: High

Exploit likelihood

0.40%Up 0.4 points since May 5, 2026

What each source reports

CVE List Score used 8.3

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

Record: CVE-2026-41927
CVSS 4.0: 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
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2026-27127 8.3

Record: EUVD-2026-27127
CVSS 4.0: 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
Updated: 2026-11-02

GitHub AdvisoriesGHSA-59q4-38q7-24rv 8.3

WDR201A WiFi Extender (HW V2.1, FW LFMZX28040922V1.02) contains a stack-based buffer overflow...

Record: GHSA-59q4-38q7-24rv
CVSS 4.0: 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
Weakness: CWE-121
Updated: 2026-11-02

NVD 8.3

Record: CVE-2026-41927
CVSS 4.0: 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
Weakness: CWE-121
Updated: 2026-11-02

Affected products

shenzhen yipu commercial and trading co., ltd wdr201a wifi extender

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-41927 is a high vulnerability (CVSS 8.3) in Shenzhen Yipu Commercial And Trading Co., Ltd Wdr201a Wifi Extender, published May 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.