CVE-2021-40556
HIGHASUS RT-AX56U Router <3.0.0.4.386.44266 - Buffer Overflow
Title source: llmDescription
A stack overflow vulnerability exists in the httpd service in ASUS RT-AX56U Router Version 3.0.0.4.386.44266. This vulnerability is caused by the strcat function called by "caupload" input handle function allowing the user to enter 0xFFFF bytes into the stack. This vulnerability allows an attacker to execute commands remotely. The vulnerability requires authentication.
References (2)
Core 2
Core References
Product, Vendor Advisory
https://www.asus.com/tw/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/
Exploit, Third Party Advisory
https://x1ng.top/2021/10/14/ASUS%E6%A0%88%E6%BA%A2%E5%87%BA%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90/
Scores
CVSS v3
8.8
EPSS
0.0137
EPSS Percentile
80.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-787
Status
published
Products (1)
asus/rt-ax56u_firmware
3.0.0.4.386.44266
Published
Oct 06, 2022
Tracked Since
Feb 18, 2026