Stack Overflow Vulnerability in ASUS RT-AX56U Router
CVE-2021-40556

8.8HIGH

Key Information:

Vendor

Asus
Status
Rt-ax56u Firmware
Vendor
CVE Published:
6 October 2022

What is CVE-2021-40556?

A stack overflow vulnerability exists in the HTTP service of the ASUS RT-AX56U Router, specifically in version 3.0.0.4.386.44266. This vulnerability arises from the improper handling of user input in the 'caupload' function, which allows an attacker to send excessively large data (up to 0xFFFF bytes) to the stack. Successfully exploiting this weakness could enable attackers to execute arbitrary commands remotely. Although exploitation requires user authentication, the potential for unauthorized execution underscores the importance of prompt remediation.

References

https://www.asus.com/tw/Networking-IoT-Servers/WiFi-Route...
https://x1ng.top/2021/10/14/ASUS%E6%A0%88%E6%BA%A2%E5%87%...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-40556 : Stack Overflow Vulnerability in ASUS RT-AX56U Router