Description
A stack-based buffer overflow exists in the GoAhead-Webs HTTP daemon on KuWFi 4G LTE AC900 devices with firmware 1.0.13. The /goform/formMultiApnSetting handler uses sprintf() to copy the user-supplied pincode parameter into a fixed 132-byte stack buffer with no bounds checks. This allows an attacker to corrupt adjacent stack memory, crash the web server, and (under certain conditions) may enable arbitrary code execution.
Affected products
kuwfi: ac900 firmware; kuwfi: ac900
References4
- drive.proton.me/urls/HJCJYAC7JM#XtHcm3P7QaYk Broken Link
- github.com/actuator/cve/blob/main/Kuwfi/CVE-2025-68706.txt Third Party Advisory
- github.com/actuator/cve/tree/main/Kuwfi Third Party Advisory
- kuwfi.com/products/kuwfi-gigabit-wireless-router-4g-lte-wifi-ro… Product
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 5% percentile: 92 · as of 11 November 2026
- CWE
- CWE-121
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.