Security readout for executives and security teams
Plain-English summary
CVE-2018-21168 is a sensitive information disclosure issue in many older NETGEAR routers, gateways, and extenders. An unauthenticated attacker on an adjacent network could expose confidential information. The business concern is unmanaged or legacy networking gear still running firmware older than the fixed versions named by NETGEAR.
Executive priority
Treat this as a moderate-priority network hygiene issue. It is not documented as actively exploited here, but it can expose sensitive information from perimeter or branch-office devices that are often overlooked in patch programs.
Technical view
The CVSS 3.0 vector is AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, score 6.5. The issue affects listed NETGEAR models before specific firmware versions, with high confidentiality impact and no stated integrity or availability impact. The provided sources do not include CWE detail or exploit mechanics.
Likely exposure
Exposure is most likely in environments still using the named NETGEAR models on firmware below the listed fixed versions. Risk is higher where Wi-Fi, LAN, guest, or adjacent-network access reaches device management surfaces.
Exploitation context
The source bundle does not show CISA KEV inclusion, and no cited source states active exploitation. CVSS indicates exploitation requires adjacent-network access, no credentials, no user interaction, and low attack complexity.
Researcher notes
The supplied CVE data lists many affected models and fixed-version thresholds, but not the vulnerable endpoint, data type disclosed, or exploit details. Analysis should stay model-and-firmware focused unless NETGEAR advisory text provides more specifics.
Mitigation direction
- Inventory NETGEAR devices and identify exact model and firmware version.
- Upgrade affected models to the fixed NETGEAR firmware version or later.
- Restrict device management access to trusted administrative networks.
- Disable unnecessary remote or guest access to router management interfaces.
- Check NETGEAR advisory and support pages for model-specific guidance.
- Replace unsupported devices if fixed firmware is unavailable.
Validation and detection
- Compare each device model and firmware against the affected-version list.
- Confirm firmware is at or above the fixed version named for that model.
- Verify management interfaces are not reachable from guest or untrusted networks.
- Review network inventory for legacy NETGEAR devices missed by endpoint tools.
- Document exceptions where devices are unsupported or cannot be updated.
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-2018-21168 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
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/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:A/A:N/C:H/I:N/PR:N/S:U/UI:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AC:L/AV:A/A:N/C:H/I:N/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055190/Security-Advisory-for-Sensitive-Information-Disclosure-on-Some-Routers-Gateways-and-Extenders-PSV-2017-3059CVE 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.