Security readout for executives and security teams
Plain-English summary
CVE-2018-21165 is a denial-of-service issue in specific older NETGEAR router firmware. A successful attack could disrupt router availability, affecting network connectivity, but the source data shows no confidentiality or integrity impact.
Executive priority
Treat as a moderate operational-risk issue. Prioritize remediation where affected routers support business connectivity, remote access, or branch-office operations.
Technical view
The CVSS 3.0 vector is AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H with score 4.5. The issue affects listed NETGEAR models running firmware earlier than the versions named in the CVE description.
Likely exposure
Exposure is likely limited to organizations or sites still using the listed NETGEAR router models with firmware below the named fixed versions, especially unmanaged small-office, branch, or lab networks.
Exploitation context
The provided sources do not show known active exploitation, and the CVE is not listed as CISA KEV. The CVSS vector indicates adjacent-network access and high privileges are required.
Researcher notes
The public data is sparse: no CWE is listed, affected CPEs are absent, and technical root-cause details are not provided. Avoid assuming exploitability beyond the CVSS vector and NETGEAR advisory.
Mitigation direction
- Inventory NETGEAR router models listed in the CVE description.
- Compare installed firmware against the fixed-version thresholds in the CVE record.
- Review the NETGEAR advisory for model-specific update guidance.
- Apply vendor-supported firmware updates where available.
Validation and detection
- Confirm whether any listed NETGEAR models are deployed.
- Record each device firmware version from authorized management interfaces.
- Verify firmware is not earlier than the CVE’s named fixed versions.
- Check operational logs for unexplained router crashes or availability interruptions.
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-2018-21165 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
- 4.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:N/I:N/PR:H/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:N/I:N/PR:H/S:U/UI:N0.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.5MediumVector: CVSS:3.0/AC:L/AV:A/A:H/C:N/I:N/PR:H/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055194/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3170CVE 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.