Security readout for executives and security teams
Plain-English summary
CVE-2018-21151 is a post-authentication buffer overflow in specific NETGEAR gateways and routers. An attacker would need authenticated access, but successful exploitation could seriously affect confidentiality, integrity, and availability. Organizations using listed models should verify firmware quickly and update affected devices.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It is not cited as actively exploited, but affected routers are control points for network traffic, so delayed remediation can raise business risk if admin credentials are compromised.
Technical view
The CVE describes a buffer overflow reachable by an authenticated user on D7800, R7500v2, R7800, R8900, R9000, WNDR4300v2, and WNDR4500v3 before specific firmware versions. CVSS 3.0 is 6.8 with adjacent network attack vector, high privileges required, low complexity, and high CIA impact.
Likely exposure
Exposure is limited to the named NETGEAR models running firmware older than the fixed versions. Risk is higher where router administration is reachable by many users, poorly segmented, or using shared administrative credentials.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The flaw requires authentication, and CVSS indicates adjacent network access and high privileges, reducing broad internet-scale risk but not insider or compromised-admin scenarios.
Researcher notes
No CWE is provided in the source bundle, and affected CPE data is listed as n/a. Research should focus on model and firmware validation, administrative exposure, and vendor advisory alignment rather than assuming broader NETGEAR product impact.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware version or later.
- Prioritize devices with shared, weak, or broadly distributed administrative access.
- Restrict router administration to trusted management networks and administrators.
- Check the NETGEAR advisory for model-specific firmware guidance.
- Retire unsupported devices if fixed firmware is unavailable.
Validation and detection
- Inventory deployed NETGEAR devices and confirm exact model numbers.
- Compare current firmware against each fixed version in the advisory.
- Verify administrative interfaces are not exposed to untrusted networks.
- Review admin account usage for unnecessary or shared access.
- Document any device that cannot be upgraded and its compensating controls.
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-2018-21151 mapping review
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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/000059482/Security-Advisory-for-Post-Authentication-Buffer-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3154CVE 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.