Security readout for executives and security teams
Plain-English summary
CVE-2017-18851 is a post-authentication command injection issue in several NETGEAR routers and modem routers. An attacker who already has authenticated access could run unintended commands on the device. The business risk is concentrated where affected devices remain deployed with old firmware or weakly controlled administrative access.
Executive priority
Treat this as a targeted router hygiene issue, not an emergency based on the provided evidence. Prioritize remediation where affected NETGEAR devices support business connectivity, remote sites, or unmanaged networks, especially if administrative credentials are broadly shared.
Technical view
The CVE describes command injection reachable by an authenticated user on NETGEAR D8500, R6400, R6400v2, R8300, R8500, and R6100 firmware up to the listed versions. CVSS 3.0 is 6.7, reflecting high confidentiality, integrity, and availability impact but high privileges and local attack vector in the provided record.
Likely exposure
Exposure is likely limited to environments still running the named NETGEAR models at or below the affected firmware versions. Internet-facing or poorly protected management access would raise operational concern, but the bundle does not state remote unauthenticated exposure.
Exploitation context
The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. The vulnerability requires an authenticated user according to the CVE description, so credential compromise, shared admin passwords, or insider access are relevant risk factors.
Researcher notes
Affected version evidence comes from the CVE description only. The provided bundle has no CWE, no detailed vulnerable parameter, no proof-of-concept, and no explicit fixed firmware version text. Avoid assuming exploitation paths beyond authenticated command injection.
Mitigation direction
- Identify whether listed NETGEAR models are deployed.
- Compare installed firmware with the affected version thresholds.
- Review the NETGEAR advisory for supported remediation guidance.
- Restrict administrative access to trusted users and management networks.
- Replace unsupported affected devices if vendor remediation is unavailable.
Validation and detection
- Inventory D8500, R6400, R6400v2, R8300, R8500, and R6100 devices.
- Record firmware versions from device administration interfaces or asset data.
- Flag versions at or below the CVE-listed affected releases.
- Confirm whether NETGEAR advisory remediation has been applied.
- Check administrative access controls and account ownership.
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-2017-18851 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
- 6.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:L/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:L/A:H/C:H/I:H/PR:H/S:U/UI:N0.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.7MediumVector: CVSS:3.0/AC:L/AV:L/A:H/C:H/I:H/PR:H/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000045850/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-and-Modem-Routers-PSV-2017-1207CVE 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.