CVE-2026-6643

CRITICAL

Asustor Inc. Adm < 4.3.3.RR42 - Buffer Overflow

Title source: rule
STIX 2.1

Description

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.

Exploits (1)

github WORKING POC
by mlgzackfly · pythonpoc
https://github.com/mlgzackfly/CVE-2026-6643

Scores

CVSS v3 9.9
EPSS 0.0013
EPSS Percentile 32.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-121
Status published
Products (3)
asustor/data_master 4.1.0.rhu2 - 4.3.3.RR42
ASUSTOR Inc./ADM 4.1.0 - 4.3.3.RR42
ASUSTOR Inc./ADM 5.0.0 - 5.1.2.REO1
Published Apr 20, 2026
Tracked Since Apr 20, 2026