VULNERABILITY INTELLIGENCE

CVE-2021-40556

CVSS score8.8 HIGH

EPSS probability1.63%

CISA KEVNot currently listed

Published2022-10-06

Last modified2026-06-17

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

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.

Weakness classification

CWE-787: Out-of-bounds Write

Primary references

cve@mitre.org — Product, Vendor Advisory
cve@mitre.org — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Product, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory