Security readout for executives and security teams
Plain-English summary
TerraMaster TOS 4.2.06 and earlier has an access control flaw where a remote authenticated user can bypass read-only folder restrictions and gain full access to NAS folders. This threatens confidentiality and integrity of files stored on affected NAS devices.
Executive priority
Treat this as high priority where TerraMaster NAS stores business-critical, regulated, or backup data. The flaw can turn limited authenticated access into full folder access, but public evidence does not confirm active exploitation.
Technical view
The CVE describes incorrect access control in TerraMaster TOS <= 4.2.06. The attacker must be authenticated and remote, but can bypass read-only restrictions and obtain full access to any NAS folder. The source bundle provides no CVSS, CWE, CPE, fixed version, or patch details.
Likely exposure
Exposure is limited to TerraMaster NAS deployments running TOS 4.2.06 or earlier where untrusted or low-privilege authenticated users can access the NAS.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The risk still matters because any compromised or malicious authenticated NAS account could exceed assigned read-only permissions.
Researcher notes
Evidence is sparse: the CVE record names the product/version boundary and access-control impact, but lacks CVSS, CWE, CPEs, exploit status, and fixed-version details. Avoid assuming unauthenticated exposure or a specific patch without vendor confirmation.
Mitigation direction
- Inventory TerraMaster NAS devices and confirm TOS versions.
- If TOS is <= 4.2.06, check TerraMaster guidance for a fixed supported release.
- Limit NAS access to trusted networks and required users only.
- Remove stale accounts and reduce broad read-only share assignments.
- Monitor NAS folders for unexpected writes, deletes, or permission changes.
Validation and detection
- Confirm whether any TerraMaster NAS runs TOS 4.2.06 or earlier.
- Review accounts with read-only access to sensitive NAS folders.
- Perform controlled permission testing using non-sensitive test folders.
- Check NAS audit logs for unexpected file modifications by read-only users.
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.
CVE-2020-29189 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/CVE reference, mitre
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.