Security readout for executives and security teams
Plain-English summary
This flaw affects the D-Link NPAPI extension used with certain DIR-850L Rev A and Rev B router firmware. It fails to properly verify SSL server certificates, so a network attacker could impersonate a server and capture sensitive information.
Executive priority
Treat this as a legacy-router exposure issue. Prioritize review where DIR-850L devices remain in business networks or remote offices, especially if cloud or browser-based management is used.
Technical view
CVE-2017-14420 is improper X.509 certificate validation in the D-Link NPAPI extension for DIR-850L Rev A firmware through FW114WWb07_h2ab_beta1 and Rev B through FW208WWb02. The stated impact is server spoofing and sensitive-information exposure by a man-in-the-middle attacker using a crafted certificate.
Likely exposure
Exposure is limited to environments using the D-Link DIR-850L Rev A or Rev B with the listed firmware and the affected D-Link NPAPI extension workflow.
Exploitation context
The sources describe man-in-the-middle exploitation requiring network positioning and a crafted certificate. The bundle does not cite CISA KEV listing or other evidence of active exploitation.
Researcher notes
The record provides no CVSS, CWE, or vendor fix details in the supplied bundle. Analysis should stay bounded to certificate-validation failure, MITM server spoofing, and sensitive-information exposure for the named firmware lines.
Mitigation direction
- Inventory DIR-850L Rev A and Rev B devices and firmware versions.
- Check D-Link guidance for fixed firmware, replacement, or retirement options.
- Avoid affected NPAPI extension workflows on untrusted networks.
- Restrict router administration and cloud-management access to trusted networks.
Validation and detection
- Confirm device hardware revision and firmware version against the CVE description.
- Identify whether the D-Link NPAPI extension is installed or used.
- Review network paths where a man-in-the-middle attacker could intercept SSL connections.
- Monitor for unexpected certificate warnings or suspicious management-session behavior.
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-2017-14420 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://pierrekim.github.io/blog/2017-09-08-dlink-850l-mydlink-cloud-0days-vulnerabilities.htmlCVE 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.