Medium severity · published Feb 25, 2026
CVE-2026-3100
An improper certificate validation vulnerability was found in the FTP Backup on the ADM.
6.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
ADM · ASUSTOR
4.1.0 through 4.3.3.ROF1; 5.0.0 through 5.1.2.RE51 · source: vendor
DM
Data Master · Asustor
4.1.0.rhu2 through 4.3.3.rof1; 5.0.0.ra82 before 5.1.2.reo1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3100
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3100
Vendor Advisory
https://www.asustor.com/security/security_advisory_detail?id=53
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