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CVE-2026-6644

Asustor Data Master remote code execution

9.1 CRITICALEPSS 2.08%
  1. Published20 Apr 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Asustor Data Master≥ 4.1.0.rhu2 < 4.3.3.RR42 · ≥ 5.0.0.ra82 < 5.1.2.reo1

Remediation

Fixed in
Asustor Data Master≥ 4.3.3.RR42

References

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Frequently asked

Is CVE-2026-6644 being actively exploited?

CVE-2026-6644 is not in the CISA KEV catalog. Its EPSS exploit probability is 2.08%.

How severe is CVE-2026-6644?

CVE-2026-6644 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 2.08% probability of exploitation.

Which products are affected by CVE-2026-6644?

Affected products include Asustor Data Master.

How do I fix CVE-2026-6644?

Upgrade affected software to a fixed version, for example Asustor Data Master 4.3.3.RR42 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-6644 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.