Security readout for executives and security teams
Plain-English summary
CVE-2021-38535 is a stored cross-site scripting issue in multiple NETGEAR routers and gateways. An attacker with high privileges and adjacent-network access could store script content that runs when a user interacts with the affected interface. Public metadata rates it medium severity, and CISA KEV evidence is not present in the provided bundle.
Executive priority
Handle as a planned remediation item, not an emergency, unless affected devices manage sensitive networks or have broadly reachable administration paths. Prioritize firmware updates during the next network maintenance cycle and confirm unsupported devices are tracked for replacement.
Technical view
The CVSS 3.1 vector is 4.3: AV:A/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. The issue affects listed NETGEAR models before specified firmware versions, including D6200, D7000, R6020, R6080, R6120, R6260, R6700v2, RAX35, RAX40, and related models. No CWE is provided in the bundle.
Likely exposure
Exposure is most likely in organizations or homes using the listed NETGEAR routers or gateways on firmware below the named fixed versions. The CVE affected-products array is marked n/a, so validation should rely on the model and firmware list in the CVE description and NETGEAR advisory.
Exploitation context
The provided sources do not show known active exploitation, and KEV is false. The CVSS vector indicates adjacent-network access, high privileges, and user interaction are required, reducing broad remote exploitation likelihood. Stored XSS can still affect administrative trust boundaries if a vulnerable management interface is used.
Researcher notes
Evidence is limited to CVE metadata and the NETGEAR advisory reference. Do not infer affected products beyond the listed model and version set. The bundle does not provide exploit details, proof-of-concept status, or named workarounds beyond updating according to vendor guidance.
Mitigation direction
- Identify listed NETGEAR models and record current firmware versions.
- Upgrade affected devices to the named fixed version or later.
- Review NETGEAR advisory guidance for model-specific firmware details.
- Limit management access to trusted administrators and trusted networks.
- Replace unsupported devices if fixed firmware is unavailable.
Validation and detection
- Compare device model and firmware against the CVE affected-version list.
- Confirm firmware is at or above the fixed version named for that model.
- Check whether management interfaces are reachable from untrusted networks.
- Review administrative logs for unexpected configuration or account changes.
- Document devices that cannot be updated and track compensating controls.
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-2021-38535 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/000063773/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Routers-and-Gateways-PSV-2019-0192CVE 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.