Security readout for executives and security teams
Plain-English summary
CVE-2018-21214 is a high-severity pre-authentication buffer overflow in specific NETGEAR routers, gateways, and extenders. An attacker who can reach the affected network path may compromise confidentiality, integrity, and availability without credentials or user interaction.
Executive priority
Treat as high priority for environments using the listed NETGEAR devices. The business concern is unauthenticated compromise risk on network infrastructure, especially where devices bridge sensitive users, guests, or operational networks.
Technical view
The CVE describes an unauthenticated buffer overflow affecting listed NETGEAR models below specified firmware versions. CVSS 3.0 is 8.8 with low complexity, no privileges, no user interaction, adjacent-network attack vector, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on affected NETGEAR devices reachable from an adjacent network path, such as local network or wireless proximity. Confirm exact model and firmware: D3600, D6000, EX2700, R6100, R7500v2, R9000, WN2000RPTv3, WN3000RPv3, and WN3100RPv2.
Exploitation context
The supplied sources do not state active exploitation, public exploit availability, or KEV listing. Risk remains material because the flaw is pre-authentication, low-complexity, and can affect all three security properties according to the CVSS vector.
Researcher notes
The affected-version list is explicit in the CVE description, but the supplied bundle does not include root-cause detail, exploit primitives, or named mitigations beyond firmware thresholds. Avoid claiming internet-wide exploitability because the CVSS vector is adjacent network.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware versions or later.
- Check the NETGEAR advisory for model-specific firmware guidance.
- Restrict access to device management interfaces where possible.
- Replace unsupported devices if fixed firmware is unavailable.
- Prioritize devices on shared, guest, or exposed network segments.
Validation and detection
- Inventory NETGEAR routers, gateways, and extenders by exact model.
- Compare installed firmware against the affected version thresholds.
- Confirm updated firmware is running after remediation.
- Verify management exposure is limited to trusted networks.
- Document exceptions for devices awaiting firmware or replacement.
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-2018-21214 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
- High
- CVSS
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N
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:H/C:H/I:H/PR:N/S:U/UI:N2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055123/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-Gateways-and-Extenders-PSV-2017-2488CVE 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.