Security readout for executives and security teams
Plain-English summary
CVE-2018-21228 is an authenticated command injection flaw in specific NETGEAR routers, gateways, and extenders. A user who already has high privileges and network adjacency could potentially run unauthorized commands on the device, creating risk to confidentiality, integrity, and availability.
Executive priority
Treat this as a moderate operational risk for legacy NETGEAR infrastructure. Prioritize remediation where affected devices protect sensitive networks, provide remote access, or have broad internal reach.
Technical view
The CVSS 3.0 vector is AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, score 6.8. The issue affects listed NETGEAR firmware versions before the fixed releases. The source bundle does not provide CWE mapping, root-cause details, exploit primitives, or proof-of-concept information.
Likely exposure
Exposure is likely limited to environments still using the named NETGEAR models below fixed firmware levels, especially where management access is reachable from adjacent or semi-trusted networks.
Exploitation context
The bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires an authenticated high-privilege user and adjacent network access, reducing broad internet-scale risk but keeping insider, compromised-admin, and poorly segmented network scenarios relevant.
Researcher notes
The public bundle is sparse: it identifies affected models, fixed version thresholds, CVSS, and authenticated command injection, but not the vulnerable endpoint, CWE, patch diff, or exploit status. Avoid assuming broader NETGEAR exposure beyond the listed models.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware versions or later.
- Check the NETGEAR advisory for model-specific firmware guidance.
- Restrict device administration to trusted management networks.
- Remove or replace unsupported devices if fixed firmware is unavailable.
- Review administrative account access and remove unnecessary users.
Validation and detection
- Inventory NETGEAR models and firmware versions in use.
- Compare firmware against the affected version list in the advisory.
- Confirm management interfaces are not reachable from untrusted networks.
- Review administrative users for unexpected or stale accounts.
- Track vendor guidance for any revised remediation details.
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-2018-21228 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/000055106/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-Gateways-and-Extenders-PSV-2017-0607CVE 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.