Security readout for executives and security teams
Plain-English summary
This CVE affects NETGEAR R7800 routers running firmware before 1.0.2.46. The issue is described as a security misconfiguration. The available scoring indicates an attacker on an adjacent network could affect confidentiality, integrity, and availability without credentials or user interaction.
Executive priority
Prioritize remediation during the next router maintenance window, sooner for sites with guest, shared, or unmanaged local network access. This is high severity, but the provided sources do not show known active exploitation.
Technical view
CVE-2018-21158 is a high-severity NETGEAR R7800 security misconfiguration affecting versions before 1.0.2.46. The CVSS 3.0 vector is AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating adjacent-network reach, low complexity, no privileges, no user interaction, and high impact.
Likely exposure
Exposure is most likely where NETGEAR R7800 routers remain on firmware earlier than 1.0.2.46, especially on networks where untrusted users can reach the device over local or adjacent network paths.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector supports adjacent-network exploitation risk, but the public details provided do not describe exploit mechanics.
Researcher notes
Evidence is limited to the CVE record, CVE List entry, and NETGEAR advisory reference. No CWE, exploit details, or affected CPEs are provided in the bundle. Avoid assuming other NETGEAR models are affected unless confirmed by the vendor advisory.
Mitigation direction
- Identify NETGEAR R7800 routers in the environment.
- Upgrade affected R7800 devices to firmware 1.0.2.46 or later.
- Review the NETGEAR advisory for vendor-specific remediation guidance.
- Prioritize routers reachable from shared, guest, or untrusted local networks.
Validation and detection
- Confirm each device model is NETGEAR R7800.
- Record the installed firmware version on each device.
- Treat versions earlier than 1.0.2.46 as affected.
- Verify remediation by confirming firmware is 1.0.2.46 or later.
- Document any device that cannot be upgraded promptly.
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-2018-21158 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
- 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/000059472/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-PSV-2017-0700CVE 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.