Security readout for executives and security teams
Plain-English summary
This flaw lets someone who already has authenticated access to certain NETGEAR routers and gateways run operating-system commands on the device. It is not described as exploitable without credentials, but successful exploitation could fully compromise the device and disrupt routing, DNS, or local network trust.
Executive priority
Treat as a scheduled but important network-edge remediation. Prioritize devices with exposed admin interfaces, shared credentials, or critical branch connectivity because compromise could affect network availability and trust.
Technical view
CVE-2018-21154 is a post-authentication command injection issue affecting listed NETGEAR D7800, DM200, R6100, R7500, R7500v2, and R7800 firmware versions. The CVSS vector indicates adjacent-network attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to the specified NETGEAR models running firmware older than the listed fixed thresholds. Risk is highest where router administration is reachable from broadly used LANs, shared admin accounts, or untrusted adjacent networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The weakness requires authenticated access and appears adjacent-network scoped by CVSS, but impact is high once the attacker has sufficient privileges.
Researcher notes
The public bundle names affected models and versions but does not include CWE mapping, exploit details, or compensating controls beyond vendor advisory reference. Avoid assuming broader NETGEAR exposure without matching model and firmware evidence.
Mitigation direction
- Update affected NETGEAR firmware to the listed fixed version or later.
- Check the NETGEAR advisory for model-specific upgrade guidance.
- Restrict administrative access to trusted management networks only.
- Remove shared or unnecessary administrator accounts.
- Disable remote administration unless explicitly required and secured.
Validation and detection
- Inventory NETGEAR D7800, DM200, R6100, R7500, R7500v2, and R7800 devices.
- Compare installed firmware against the affected version thresholds.
- Confirm router admin interfaces are not exposed to untrusted networks.
- Review administrative account access and recent configuration changes.
- Document remediation status for each affected device.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-21154 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/000059479/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Gateways-and-Routers-PSV-2017-3133CVE 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.