Security readout for executives and security teams
Plain-English summary
This CVE describes an information disclosure issue in TerraMaster F4-210 and F2-210 NAS devices running TOS 4.2.x, specifically noted as 4.2.15-2107141517. A reachable API endpoint can expose the first administrator password hash plus device details such as MAC address and internal IP address.
Executive priority
Treat this as high priority for any exposed TerraMaster NAS. The direct business risk is credential compromise and sensitive network reconnaissance from a storage appliance, even though official severity and active exploitation evidence are absent in the bundle.
Technical view
The reported issue is unauthenticated or insufficiently protected disclosure from the TerraMaster TOS endpoint /module/api.php?mobile/wapNasIPS. The CVE record names F4-210 and F2-210 on TOS 4.2.x and states that administrator hash material and network identifiers may be returned. CVSS, CWE, and vendor fixed-version details are not provided in the bundle.
Likely exposure
Exposure is most likely where affected TerraMaster NAS management or API surfaces are reachable from the internet or broad internal networks. The bundle only names F4-210, F2-210, and TOS 4.2.x, with 4.2.15-2107141517 specifically mentioned.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. A public reference describes the vulnerable request, so defenders should treat details as public and prioritize reducing reachability while checking vendor guidance.
Researcher notes
Evidence is limited to the CVE description and one public technical reference. No CVSS vector, CWE mapping, patch version, authentication precondition, or exploit-in-the-wild confirmation is provided, so validation should focus on asset exposure and vendor-confirmed remediation status.
Mitigation direction
- Identify TerraMaster F4-210 and F2-210 devices running TOS 4.2.x.
- Restrict NAS management and API access to trusted administrative networks only.
- Check TerraMaster guidance for fixed firmware or supported upgrade paths.
- After remediation, rotate administrator credentials due to disclosed hash risk.
- Review remote access, port forwarding, and VPN exposure for affected devices.
Validation and detection
- Inventory NAS model and TOS version against the CVE description.
- Confirm whether management/API interfaces are reachable from untrusted networks.
- Review logs for requests referencing the named vulnerable endpoint.
- Perform only authorized controlled validation; avoid collecting or sharing hash material.
- Document firmware state, exposure path, and remediation decision.
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-2021-45842 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/CVE reference · x_refsource_MISC
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.