Security readout for executives and security teams
Plain-English summary
This CVE affects certain older NETGEAR routers and gateways. An unauthenticated attacker on an adjacent network could trigger a buffer overflow before authentication, potentially compromising confidentiality, integrity, and availability. The source identifies fixed firmware thresholds for D3600, D6000, D6100, and R6100.
Executive priority
Treat this as a high-priority legacy network-device remediation item. It is not shown as actively exploited in the provided sources, but pre-authentication router flaws can create serious business risk if exposed on trusted networks.
Technical view
CVE-2018-21217 is a pre-authentication buffer overflow in specified NETGEAR devices. CVSS 3.0 is 8.8 high with adjacent-network attack vector, low complexity, no privileges, and no user interaction. Affected versions are D3600/D6000 before 1.0.0.67, D6100 before 1.0.0.56, and R6100 before 1.0.1.20.
Likely exposure
Exposure is most likely where the listed NETGEAR models remain deployed on LAN or Wi-Fi accessible networks with firmware below the fixed versions. The CVSS vector indicates adjacent-network exposure, not confirmed internet-wide reach from the provided sources.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Risk remains meaningful because the flaw is unauthenticated, pre-authentication, low-complexity, and rated high impact across confidentiality, integrity, and availability.
Researcher notes
The CVE source bundle lists generic affected metadata, but the description and NETGEAR reference identify specific models and fixed versions. No CWE, exploit details, or active exploitation evidence are provided. Avoid assuming additional models or attack paths without vendor confirmation.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware versions or later.
- Prioritize D3600, D6000, D6100, and R6100 inventory checks.
- Review the NETGEAR advisory for device-specific firmware guidance.
- Limit management and device access to trusted local networks.
- Replace devices if fixed firmware is unavailable from NETGEAR.
Validation and detection
- Identify deployed NETGEAR D3600, D6000, D6100, and R6100 devices.
- Record current firmware versions for each identified device.
- Compare versions against the fixed thresholds in the advisory.
- Confirm adjacent-network access is restricted to trusted users.
- Document remediation status and remaining exceptions.
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
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CVE-2018-21217 mapping review
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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/000055120/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2484CVE 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.