Security readout for executives and security teams
Plain-English summary
This is a post-authentication stack overflow in several older NETGEAR routers and gateways. An attacker would need valid access, but successful exploitation could seriously compromise router confidentiality, integrity, and availability. Treat affected network-edge devices as business-sensitive infrastructure.
Executive priority
Handle as a prioritized network infrastructure patch, especially for offices using legacy NETGEAR devices. It is not presented as actively exploited, but the potential device compromise impact justifies prompt inventory, upgrade, and access review.
Technical view
CVE-2018-21201 affects listed NETGEAR D6100, R6100, R7800, R9000, WNDR, and WNR2000v5 firmware versions before vendor-fixed releases. CVSS 3.0 is 6.8 with adjacent attack vector, low complexity, high privileges required, no user interaction, and high CIA impact.
Likely exposure
Exposure is likely limited to organizations still running the named NETGEAR models below the fixed firmware versions. Risk is higher where admin credentials are broadly shared, stale, or compromised. The source bundle does not establish broad internet exposure.
Exploitation context
The supplied sources describe a post-authentication issue and do not cite known active exploitation. CISA KEV is false in the bundle. No public exploit details are provided here, so exploitation maturity is unclear from the supplied evidence.
Researcher notes
Evidence is limited to the CVE description and NETGEAR advisory reference. The bundle provides no CWE, vulnerable endpoint, exploit proof, or detailed mitigation beyond fixed firmware thresholds. Validation should focus on model and firmware matching rather than exploit reproduction.
Mitigation direction
- Identify all listed NETGEAR models in use.
- Upgrade affected devices to the vendor-fixed firmware or later.
- Restrict administrative access to trusted networks and administrators.
- Rotate router administrative credentials where exposure is suspected.
- Check current NETGEAR guidance for model-specific instructions.
Validation and detection
- Compare device model and firmware against the affected version list.
- Confirm upgraded devices report fixed firmware or later.
- Review administrative access paths and credential ownership.
- Check device logs for unexpected administrative activity.
- Document exceptions where firmware cannot be updated.
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-2018-21201 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/000055148/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2591CVE 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.