Security readout for executives and security teams
Plain-English summary
This is a NETGEAR router and gateway flaw where a logged-in, highly privileged user could trigger a stack-based buffer overflow. Business risk is concentrated in older affected devices that still run vulnerable firmware. The public bundle does not show confirmed active exploitation.
Executive priority
Treat this as a moderate priority hygiene issue. It is not KEV-listed, but affected network edge devices can have high business impact if privileged access is compromised or shared too broadly.
Technical view
CVE-2018-21198 affects specific NETGEAR D6100, R7800, R9000, WNDR, and WNR models before listed firmware versions. CVSS 3.0 is 6.8, with adjacent-network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely limited to organizations still operating the named NETGEAR models on firmware older than the fixed versions. Risk depends on whether untrusted or broad administrator access exists on the local network.
Exploitation context
The source bundle identifies this as post-authentication and stack-based. KEV is false, and no supplied source states active exploitation or public weaponization. Evidence is incomplete on practical exploit availability.
Researcher notes
The CNA description lists fixed-version thresholds but the affected CPE fields are not populated. Analysis should stay model-and-firmware specific and avoid assuming impact beyond authenticated stack overflow on the named NETGEAR devices.
Mitigation direction
- Inventory the listed NETGEAR models in offices, labs, and remote sites.
- Update affected devices to the fixed firmware versions named by NETGEAR.
- Restrict router administration to trusted, necessary administrators only.
- Check NETGEAR guidance for unsupported devices or replacement options.
Validation and detection
- Compare each device model and firmware version against the affected list.
- Confirm firmware is at or above the listed fixed version.
- Review who has privileged access to router management interfaces.
- Document any devices that cannot be updated and track compensating controls.
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-2018-21198 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
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/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:H/I:H/PR:H/S:U/UI:N0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055151/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2594CVE 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.