Security readout for executives and security teams
Plain-English summary
CVE-2018-21230 is a security misconfiguration affecting many NETGEAR routers, gateways, and extenders running older firmware. The published score is medium. For executives, the main concern is unmanaged legacy network gear that may expose local network users or branch environments to confidentiality and integrity risk.
Executive priority
Treat this as a moderate-priority legacy network device cleanup issue. Prioritize environments where affected devices support business connectivity, guest Wi-Fi, branch access, or unmanaged extender deployments.
Technical view
The CVE describes incorrect security settings across numerous NETGEAR D, EX, JNR, JR, PR, R, WN, WNDR, and WNR models before listed firmware versions. CVSS 3.0 is 5.2, with adjacent-network attack vector, low complexity, no privileges, user interaction required, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is most likely where affected NETGEAR home, small-office, branch, or extender devices still run firmware below the listed fixed versions. The source bundle does not state that internet-facing administration is required or sufficient.
Exploitation context
The bundle does not identify active exploitation, and CISA KEV is false. The CVSS vector indicates exploitation is adjacent-network rather than broadly remote, requires user interaction, and does not affect availability. No exploit procedure is provided in the cited sources.
Researcher notes
The record provides a broad affected-version list but limited root-cause detail. No CWE is assigned, and normalized affected product data is listed as n/a in the supplied bundle. Validation should rely on exact NETGEAR model and firmware matching.
Mitigation direction
- Inventory NETGEAR devices and compare models against the affected list.
- Upgrade affected devices to the listed fixed firmware or later.
- Check the NETGEAR advisory for model-specific firmware and guidance.
- Retire unsupported devices that cannot receive corrected firmware.
- Restrict device administration to trusted networks and administrators.
Validation and detection
- Record each device model, hardware revision, and firmware version.
- Confirm firmware is at or above the fixed version listed for that model.
- Review network locations where affected devices bridge or extend access.
- Verify administrative interfaces are not exposed beyond trusted management networks.
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-2018-21230 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
- Medium
- CVSS
- 5.2 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/UI:R
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:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/UI:R2.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.2MediumVector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/UI:R
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055104/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-Gateways-and-Extenders-PSV-2016-0117CVE reference · x_refsource_CONFIRM
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.