Critical severity · published Apr 20, 2026
CVE-2026-6644
A command injection vulnerability was found in the PPTP VPN Clients on the ADM
9.1
CVSS
1.9%
EPSS
No
On KEV
Description
A command injection vulnerability was found in the PPTP VPN Clients on the ADM. The vulnerability allows an administrative user to break out of the restricted web environment and execute arbitrary code on the underlying operating system. This occurs due to insufficient validation of user-supplied input before it is passed to a system shell. Successful exploitation allows an attacker to achieve Remote Code Execution (RCE) and fully compromise the system.
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 80% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
ADM · ASUSTOR Inc.
4.1.0 through 4.3.3.RR42; 5.0.0 through 5.1.2.REO1 · source: vendor
DM
Data Master · Asustor
4.1.0.rhu2 before 4.3.3.RR42; 5.0.0.ra82 before 5.1.2.reo1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6644
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6644
Broken Link
https://https://www.asustor.com/security/security_advisory_detail?id=55
uky007.github.io
https://uky007.github.io/CVE-2026-6644/
More from ADM
9.9
CVE-2026-6643
A stack-based buffer overflow vulnerability in the VPN Clients on the ADM
9.2
CVE-2026-105324
An HTTP header injection vulnerability was found in the ADM
8.8
CVE-2026-67248
A stack-based buffer overflow vulnerability was found in the File Explorer on the ADM
8.1
CVE-2026-67245
A path traversal vulnerability was found in the VPN Clients on the ADM
8.1
CVE-2026-18188
A format string vulnerability was found in the Rsync Backup on the ADM