Security readout for executives and security teams
Plain-English summary
This is a post-login flaw in several NETGEAR routers and gateways. An attacker would need authenticated access and adjacent-network reachability, but successful exploitation could severely compromise confidentiality, integrity, and availability on the device.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It is not documented as exploited in the supplied sources, but affected routers are security boundary devices and successful exploitation could have high device impact.
Technical view
CVE-2018-21174 is a stack-based buffer overflow affecting specified NETGEAR firmware versions before listed fixes. CVSS 3.0 is 6.8 with low complexity, adjacent-network attack vector, high privileges required, no user interaction, and high C/I/A impact.
Likely exposure
Exposure is most likely where affected NETGEAR models remain on old firmware and management access is reachable from local or adjacent networks by privileged users.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The vulnerability is post-authentication, so credential compromise or malicious privileged access would materially increase risk.
Researcher notes
The supplied CVE metadata lists no CWE and only a NETGEAR advisory reference. Product CPE data is incomplete in the bundle, so validation should rely on model and firmware checks rather than CPE matching alone.
Mitigation direction
- Identify affected NETGEAR models and firmware versions in the environment.
- Upgrade to the fixed firmware versions named in the advisory or later.
- Restrict router administration access to trusted management networks only.
- Review NETGEAR guidance for model-specific update and hardening instructions.
Validation and detection
- Inventory D6100, R7500, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5 devices.
- Compare firmware versions against the fixed-version thresholds in the CVE record.
- Confirm administrative interfaces are not exposed beyond trusted local management paths.
- Document upgraded devices and any unsupported hardware requiring replacement.
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-2018-21174 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/000055184/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2625CVE 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.