Security readout for executives and security teams
Plain-English summary
This is a stored cross-site scripting issue in several NETGEAR routers and gateways. A malicious script could be saved in the device interface and later run in a user's browser. The published score is medium because exploitation requires adjacent-network access, high privileges, and user interaction, with limited confidentiality and integrity impact.
Executive priority
Handle as a planned remediation item, not an emergency, unless exposed management interfaces or unmanaged high-privilege access exist. Prioritize firmware confirmation for affected NETGEAR edge devices because routers and gateways are sensitive control points.
Technical view
CVE-2021-38536 affects listed NETGEAR models running firmware before specific fixed versions. CVSS 3.1 is 4.3 with AV:A/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. The source bundle does not identify the vulnerable page, request field, or CWE, so validation should focus on inventory and firmware state rather than exploit reproduction.
Likely exposure
Exposure is limited to affected NETGEAR devices on vulnerable firmware, especially where management access is reachable by untrusted local or adjacent-network users. The bundle lists many D-series, R-series, AC-series, and RAX35/RAX40 models, but does not provide CPEs or exact interface details.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. The CVSS vector indicates adjacent-network attack, high privileges, and required user interaction, making opportunistic internet-scale exploitation less likely from the provided evidence.
Researcher notes
The bundle gives affected models, fixed-version thresholds, and CVSS but no endpoint, payload class, CWE, or proof-of-concept detail. Avoid exploit validation; use firmware and exposure checks. Treat active exploitation as unconfirmed from the provided sources.
Mitigation direction
- Check NETGEAR advisory PSV-2019-0193 for the affected model and firmware guidance.
- Upgrade affected devices to the listed fixed firmware version or later where available.
- Restrict router management access to trusted administrators and trusted networks.
- Disable remote or broad management exposure if not operationally required.
- Replace unsupported devices if fixed firmware is unavailable.
Validation and detection
- Inventory NETGEAR router and gateway models against the advisory's affected list.
- Record current firmware versions and compare them with the listed fixed versions.
- Confirm management interfaces are not exposed to untrusted networks.
- Review administrative accounts and remove unnecessary high-privilege access.
- Document compensating controls for devices awaiting firmware updates.
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-2021-38536 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:R
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:3.1/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:R1.22.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:R
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000063774/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Routers-and-Gateways-PSV-2019-0193CVE reference · x_refsource_MISC
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.