CVE-2026-6643 HIGH

CVE-2026-6643: A stack-based buffer overflow vulnerability in the VPN Clients on the ADM

Vendor Asustor Inc.
Product ADM
Weakness CWE-121
Published April 20, 2026
Last update April 20, 2026

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

What the vulnerability does

01Description

A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.

Key dates

02Disclosure timeline

April 20, 2026 CVE published
April 20, 2026 Record updated