Security readout for executives and security teams
Plain-English summary
This is a NETGEAR router and gateway flaw that can let a logged-in attacker corrupt memory on affected devices. Successful abuse could compromise confidentiality, integrity, and availability. The source bundle does not show active exploitation, but outdated network edge devices deserve prompt attention.
Executive priority
Treat this as a moderate network-device remediation item. Prioritize environments still using the named NETGEAR models, because compromise of routing equipment can affect traffic confidentiality, network integrity, and availability.
Technical view
CVE-2018-21150 is a post-authentication stack-based buffer overflow affecting multiple NETGEAR models before specified firmware versions. CVSS 3.0 is 6.8 with adjacent-network access, low complexity, high privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure is most likely where listed NETGEAR models remain on firmware older than the fixed versions. Risk is higher when router administration is reachable from broader internal or adjacent networks.
Exploitation context
The provided sources describe post-authentication exploitation potential but do not include exploit details. CISA KEV status is false in the bundle, and no cited source confirms active exploitation.
Researcher notes
The bundle lacks CWE detail beyond the text description, but identifies a stack-based buffer overflow requiring authentication. Affected model/version data is specific, while exploitability details and vendor mitigation language beyond firmware thresholds are limited.
Mitigation direction
- Inventory listed NETGEAR models and current firmware versions.
- Upgrade affected devices to the model-specific fixed firmware or later.
- Use the NETGEAR advisory for exact firmware guidance.
- Restrict administrative access to trusted management networks only.
- Remove or replace devices that cannot receive supported firmware.
Validation and detection
- Confirm device model against the affected NETGEAR list.
- Record installed firmware and compare it with fixed version thresholds.
- Verify management interfaces are not exposed to untrusted networks.
- Check patch completion through asset management or device administration pages.
- Document exceptions for unsupported or unreachable devices.
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-2018-21150 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/000059483/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3155CVE 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.