CVE-2021-40556

CVSS V2 None CVSS V3 High 8.8

Description

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.

Overview

CVE ID
CVE-2021-40556

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2022-10-06T18:15:50

Last Modified Date
2022-10-07T17:39:32

Weakness Enumerations

CWE	URL
CWE-787	http://cwe.mitre.org/data/definitions/787.html

CPE Configuration (Product)

CPE	Vulnerable	Operator
		AND
cpe:2.3:o:asus:rt-ax56u_firmware:3.0.0.4.386.44266:::::::*	1	OR
cpe:2.3:h:asus:rt-ax56u:-:::::::*	0	OR

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
8.8

Base Severity
HIGH

Exploitability Score
2.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://www.asus.com/tw/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/
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/

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-40556
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40556

History

Created	Old Value	New Value	Data Type	Notes
2022-10-06 19:00:54				Added to TrackCVE
2022-12-07 05:31:31	2022-10-06T18:15Z	2022-10-06T18:15:50	CVE Published Date	updated
2022-12-07 05:31:31		2022-10-07T17:39:32	CVE Modified Date	updated
2022-12-07 05:31:31		Analyzed	Vulnerability Status	updated