What is CVE-2021-40556?

CVE-2021-40556 is a high-severity vulnerability in Asus Rt-ax56u, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-10-06.

How severe is CVE-2021-40556?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Asus Rt-ax56u

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…

Vulnerability class: Buffer Overflow

EPSS: 0.014 (68.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Asus Rt-ax56u
Asus Rt-ax56u_firmware — versions 3.0.0.4.386.44266
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (Product, Vendor Advisory)
cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40556?: CVE-2021-40556 is a high-severity vulnerability in Asus Rt-ax56u, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-10-06.
How severe is CVE-2021-40556?: High severity. CVSS v3 base score is 8.8 out of 10.