CVE-2026-6643

EUVD-2026-23786

20.04.2026, 07:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
ASUSTOR1	CNA	9.9 CRITICAL	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 35%

Affected Products (NVD)

Vendor	Product	Version
asustor	data_master	4.1.0.rhu2 ≤ 𝑥 < 4.3.3.RR42
asustor	data_master	5.0.0.ra82 ≤ 𝑥 < 5.1.2.reo1

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
asustor	adm	4.1.0 ≤	CNA
asustor	adm	5.0.0 ≤	CNA

Common Weakness Enumeration

CWE-121 - Stack-based Buffer Overflow
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

References

https://www.asustor.com/security/security_advisory_detail?id=54