CVE-2026-3100 An improper certificate validation vulnerability was found in the FTP Backup on the ADM.

High 8.3 Published 25 Feb 2026 Updated 27 Feb 2026

Attackers can intercept backup traffic and steal credentials due to improper TLS certificate validation in ASUSTOR ADM FTP backups.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-3100?

CVE-2026-3100 is a high-severity vulnerability in ASUSTOR ADM, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The FTP Backup on the ADM will not properly strictly enforce TLS certificate verification while connecting to an FTP server using FTPES/FTPS. An improper validated TLS/SSL certificates allows a remote attacker can intercept network traffic to perform a Man-in-the-Middle (MitM) attack, which may intercept, modify, or obtain sensitive information such as authentication credentials and backup data. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.ROF1 as well as from ADM 5.0.0 through ADM 5.1.2.RE51.

Weakness: CWE-295

Which versions are affected by CVE-2026-3100?

It affects 1 product.

Products include Asustor Data Master.

How do I fix CVE-2026-3100?

No fix has been published for CVE-2026-3100 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-3100 being exploited?

There is no known exploitation of CVE-2026-3100 in the wild and no public exploit code.

Sources

Also known as GHSA-3224-p867-265f.