Security readout for executives and security teams
Plain-English summary
CVE-2018-21136 is a sensitive information disclosure issue in certain NETGEAR D3600 and D6000 modem routers running firmware before 1.0.0.76. The main business risk is exposure of confidential device information, but the published CVSS vector indicates physical access is required, reducing broad remote attack likelihood.
Executive priority
Treat as a targeted remediation item, not an emergency internet-wide incident. Prioritize devices in shared offices, branch sites, customer-facing spaces, or other areas where physical access is not tightly controlled.
Technical view
The CVE records a confidentiality-only flaw affecting NETGEAR D3600 and D6000 firmware versions before 1.0.0.76. CVSS v3.0 is 4.6 with AV:P/AC:L/PR:N/UI:N/C:H/I:N/A:N, meaning low-complexity access with no privileges or user interaction, but requiring physical access.
Likely exposure
Exposure is likely limited to organizations still operating NETGEAR D3600 or D6000 modem routers below firmware 1.0.0.76, especially in sites where untrusted people can physically access equipment.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV. The CVSS vector indicates physical access is required, so remote internet-scale exploitation is not supported by the supplied evidence.
Researcher notes
Public details are sparse in the supplied bundle. The key evidence is affected model and firmware scope, sensitive information disclosure impact, CVSS physical attack vector, and lack of KEV listing. Avoid assuming remote exploitability without additional vendor evidence.
Mitigation direction
- Upgrade affected D3600 and D6000 devices to firmware 1.0.0.76 or later.
- Consult the NETGEAR advisory for model-specific firmware guidance.
- Replace devices that cannot be updated or supported safely.
- Limit physical access to deployed modem routers.
- Track vendor advisories for any revised remediation details.
Validation and detection
- Inventory NETGEAR D3600 and D6000 devices in use.
- Record current firmware versions for each device.
- Flag any device running firmware below 1.0.0.76.
- Confirm update status against NETGEAR advisory guidance.
- Review whether affected devices are physically accessible to untrusted users.
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-2018-21136 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
- 4.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:P/A:N/C:H/I:N/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:P/A:N/C:H/I:N/PR:N/S:U/UI:N0.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.6MediumVector: CVSS:3.0/AC:L/AV:P/A:N/C:H/I:N/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000060224/Security-Advisory-for-Sensitive-Information-Disclosure-on-Some-Modem-Routers-PSV-2018-0100CVE 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.