Security readout for executives and security teams
Plain-English summary
This is a stored cross-site scripting flaw in specific NETGEAR gateways and routers. Malicious content could persist in a device interface and run when a user views it. Business impact is mainly risk to router administration, settings integrity, and limited data exposure, not confirmed broad compromise.
Executive priority
Treat as a targeted remediation item for network edge hygiene. Prioritize exposed, shared, or business-critical sites, but current evidence does not support emergency response solely for this CVE.
Technical view
CVE-2018-21155 affects listed NETGEAR D7800, DM200, R-series, WNDR, and WNR2000v5 models before named firmware versions. CVSS 3.0 is 6.3 with adjacent attack vector, low complexity, no privileges, user interaction required, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely in environments still running the listed NETGEAR models below the fixed firmware versions. These are often edge, small-office, or remote-site devices that may be poorly inventoried.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates exploitation requires adjacent access and user interaction, which lowers urgency compared with remotely exploitable router flaws.
Researcher notes
The record names affected models and version thresholds but provides no CWE, CPE entries, or exploit detail. Avoid assuming broader NETGEAR impact beyond the listed devices and firmware versions.
Mitigation direction
- Upgrade affected NETGEAR devices to the listed fixed firmware versions or later.
- Review the NETGEAR advisory for model-specific firmware guidance.
- Minimize access to affected device management interfaces until updated.
- Retire unsupported or unmanageable affected devices.
Validation and detection
- Inventory NETGEAR router and gateway models across offices and remote sites.
- Compare firmware versions against the affected version list.
- Confirm upgraded devices report the fixed firmware version or later.
- Check whether affected management interfaces are reachable by unnecessary users.
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-2018-21155 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
- 6.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/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:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:R2.13.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.3MediumVector: CVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:R
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000059478/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Gateways-and-Routers-PSV-2017-3101CVE 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.