Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote user obtain a Sagemcom F@ST3486 NET router configuration backup while any valid session is active. That can expose sensitive router configuration data. The sources do not provide a CVSS score, confirmed exploitation, or vendor fix details.
Executive priority
Prioritize review if this router model exists in your environment or is remotely reachable. The issue is credible but source details are sparse, with no supplied evidence of broad exploitation or a published patch.
Technical view
CVE-2020-29138 is an incorrect access control issue in the configuration backup path of SAGEMCOM F@ST3486 NET DOCSIS 3.0 software NET_4.109.0. The CVE states that /backupsettings.conf can be downloaded remotely without authentication when any valid session is running.
Likely exposure
Exposure appears limited to organizations or households using SAGEMCOM F@ST3486 NET DOCSIS 3.0 routers running NET_4.109.0, especially where the router management surface is reachable by untrusted networks. The source bundle has incomplete affected-product metadata.
Exploitation context
The CVE record describes remote unauthenticated access under a session-dependent condition. It is not listed as KEV in the supplied bundle, and no cited source confirms active exploitation in the wild.
Researcher notes
The strongest evidence is the CVE description and linked public write-up. Affected metadata in the bundle is mostly placeholder n/a, so avoid generalizing beyond SAGEMCOM F@ST3486 NET DOCSIS 3.0 software NET_4.109.0.
Mitigation direction
- Identify any SAGEMCOM F@ST3486 NET routers in managed inventory.
- Check whether software NET_4.109.0 is present.
- Restrict router management access to trusted networks only.
- Review vendor or ISP guidance for firmware updates or configuration changes.
- Rotate exposed credentials if configuration backup access is suspected.
Validation and detection
- Confirm affected model and firmware from asset records or administrator inventory.
- Verify management interfaces are not reachable from untrusted networks.
- Review logs for unexpected configuration backup access if available.
- Check vendor, ISP, or Sagemcom advisories for remediation status.
- Assess whether any downloaded configuration data could contain sensitive settings.
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-2020-29138 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://medium.com/%40alexandrevvo/improper-access-control-in-the-sagemcom-router-model-f-st3486-net-797968e8adc8CVE 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.