How severe is CVE-2026-6644?

CVE-2026-6644 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-6644 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6644?

CVE-2026-6644 affects Asustor Data Master. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6644?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-6644 have an EU (EUVD) identifier?

Yes. CVE-2026-6644 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23784.

When was CVE-2026-6644 published?

CVE-2026-6644 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2026-6644

CVE-2026-6644 is a critical-severity vulnerability in Asustor Data Master with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 9.4
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23784
Weakness: CWE-78
Affected product: Asustor Data Master
Published: 2026-04-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-6644?: 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.
How severe is CVE-2026-6644?: CVE-2026-6644 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-6644 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6644?: CVE-2026-6644 affects Asustor Data Master. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6644?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-6644 have an EU (EUVD) identifier?: Yes. CVE-2026-6644 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23784.
When was CVE-2026-6644 published?: CVE-2026-6644 was published on 2026-04-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*

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