CVE-2026-41927 WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi
Unauthenticated attackers can achieve arbitrary code execution on WDR201A WiFi Extenders via a stack-based buffer overflow in firewall.cgi.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-41927?
CVE-2026-41927 is a high-severity memory corruption vulnerability in Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-41927?
How do I fix CVE-2026-41927?
No fix has been published for CVE-2026-41927 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-41927 being exploited?
There is no known exploitation of CVE-2026-41927 in the wild and no public exploit code.
Sources
Also known as GHSA-59q4-38q7-24rv.