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    CVE-2021-40556

    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.

    Published:Oct 6, 2022
    Last Modified:Nov 21, 2024
    EPS:Oct 6, 2022
    EPSS Score:0.00387
    CVSS Score:8.8

    Affected Products

    Vendor
    Asus
    Product
    Rt-ax56u
    Vendor
    Asus
    Product
    Rt-ax56u Firmware

    Exploits

    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/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/

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2022-26376 (CVSS 9.8) — A memory corruption vulnerability exists in the httpd unescape functionality of Asuswrt prior to 3.0.0.4.386_4…
    CVE-2021-43702 (CVSS 9) — ASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). The ASUS router admin panel does n…
    CVE-2022-23973 (CVSS 8.8) — ASUS RT-AX56U’s user profile configuration function is vulnerable to stack-based buffer overflow due to insuff…
    CVE-2022-23972 (CVSS 8.8) — ASUS RT-AX56U’s SQL handling function has an SQL injection vulnerability due to insufficient user input valida…
    CVE-2022-23971 (CVSS 8.1) — ASUS RT-AX56U’s update_PLC/PORT file has a path traversal vulnerability due to insufficient filtering for spec…
    CVE-2022-23970 (CVSS 8.1) — ASUS RT-AX56U’s update_json function has a path traversal vulnerability due to insufficient filtering for spec…
    CVE-2022-22054 (CVSS 6.5) — ASUS RT-AX56U’s login function contains a path traversal vulnerability due to its inadequate filtering for spe…
    CVE-2021-44158 (CVSS 8) — ASUS RT-AX56U Wi-Fi Router is vulnerable to stack-based buffer overflow due to improper validation for httpd p…
    CVE-2021-41435 (CVSS 9.8) — A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-A…
    CVE-2021-41436 (CVSS 7.5) — An HTTP request smuggling in web application in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High