Security readout for executives and security teams
Plain-English summary
CVE-2026-3100 affects ASUSTOR ADM’s FTP Backup when using encrypted FTP connections. The system may fail to strictly validate the FTP server’s TLS certificate. An attacker positioned on the network path could impersonate or intercept the backup connection, potentially exposing credentials and backup data.
Executive priority
Treat as high priority for ASUSTOR devices performing remote encrypted FTP backups, especially over external networks. The main business risk is exposure of backup data and credentials, which can affect recovery capability and confidentiality.
Technical view
This is a CWE-295 improper certificate validation issue in ADM FTP Backup over FTPES/FTPS. Affected versions are ADM 4.1.0 through 4.3.3.ROF1 and ADM 5.0.0 through 5.1.2.RE51. CVSS 4.0 score is 8.3. The impact is primarily confidentiality, with limited integrity impact.
Likely exposure
Exposure is most relevant where ASUSTOR ADM FTP Backup connects to remote FTPES/FTPS servers across untrusted or shared networks. Systems not using FTP Backup, or not in the affected ADM version ranges, are less likely exposed based on the provided sources.
Exploitation context
The source bundle does not report active exploitation, and this CVE is not listed as KEV. Practical exploitation requires a network-positioned attacker capable of intercepting the FTP Backup connection and abusing weak certificate validation.
Researcher notes
Evidence is limited to the CVE record and ASUSTOR advisory reference in the supplied bundle. No exploit details, proof-of-concept, or fixed version information was provided. Validate remediation directly against the vendor advisory before closing findings.
Mitigation direction
- Identify ASUSTOR ADM systems in the affected version ranges.
- Check ASUSTOR’s advisory for fixed versions or official remediation guidance.
- Update ADM if ASUSTOR provides a corrected release.
- Avoid FTP Backup over untrusted networks until remediated.
- Use trusted network paths or VPN controls for backup traffic where feasible.
Validation and detection
- Inventory ADM versions across ASUSTOR devices.
- Confirm whether FTP Backup is enabled.
- Confirm whether FTPES or FTPS is used for backup connections.
- Review backup destinations and network paths for interception risk.
- Check logs for unusual backup failures or destination changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-295: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-3100 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.3HighVector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.asustor.com/security/security_advisory_detail?id=53CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.