Security readout for executives and security teams
Plain-English summary
An attacker who already has high-privilege access from an adjacent network could trigger memory corruption on certain NETGEAR routers and gateways. Potential impact includes confidentiality, integrity, and availability compromise, but the supplied evidence does not describe unauthenticated internet-wide exposure.
Executive priority
Treat this as a targeted infrastructure-risk item. It is not shown as actively exploited, but affected routers and gateways can be high-impact control points. Patch verified devices during the next appropriate network maintenance window.
Technical view
CVE-2018-21149 is a post-authentication stack-based buffer overflow affecting listed NETGEAR device firmware versions. CVSS v3.0 is 6.8: adjacent attack vector, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact. No vulnerable endpoint, CWE, or exploit mechanics are provided.
Likely exposure
Exposure is limited to specified NETGEAR D7800, DM200, R6100, R7500, R7800, R8900, R9000, WNDR, and WNR models running firmware older than the fixed versions listed in the advisory.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation requires adjacent-network access and high privileges, reducing broad opportunistic risk but preserving serious device-impact potential.
Researcher notes
The public data is sparse: no function name, endpoint, proof of concept, CWE mapping, or exploit telemetry is included. Analysis should stay anchored to firmware version validation and the NETGEAR advisory rather than assumptions about reachability or exploitability.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware version or later.
- Prioritize devices on sensitive networks or managed by shared administrator accounts.
- Restrict administrative access to trusted users and management networks.
- Check NETGEAR guidance for any model-specific operational mitigations.
Validation and detection
- Inventory NETGEAR models against the advisory's affected device list.
- Verify each device firmware version is at or above the listed fixed release.
- Confirm administrative access is limited to authorized management paths.
- Document exceptions where firmware cannot be updated immediately.
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-2018-21149 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/000059484/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3156CVE 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.