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CVE Record

CVE-2018-21167: Certain NETGEAR devices are affected by stored XSS.

Certain NETGEAR devices are affected by stored XSS. This affects D6100 before 1.0.0.57, DM200 before 1.0.0.50, EX2700 before 1.0.1.32, EX6100v2 before 1.0.1.70, EX6150v2 before 1.0.1.70, EX6200v2 before 1.0.1.62, EX6400 before 1.0.1.78, EX7300 before 1.0.1.78, EX8000 before 1.0.0.114, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WN2000RPTv3 before 1.0.1.26, WN3000RPv3 before 1.0.2.66, WN3100RPv2 before 1.0.0.42, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.54, WNDR4500v3 before 1.0.0.54, and WNR2000v5 before 1.0.0.64.

MediumCVSS 4.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE is a stored cross-site scripting issue in multiple NETGEAR routers, gateways, extenders, and DSL modems. An already highly privileged attacker on an adjacent network could store script content that affects the device management context. Business urgency is moderate because impact is limited, but vulnerable network edge devices should be updated or replaced.

Executive priority

Treat as a routine but necessary network-device remediation. Prioritize exposed or business-critical sites, then close remaining vulnerable firmware gaps through normal patch governance.

Technical view

CVE-2018-21167 affects listed NETGEAR models below specified firmware versions. The CVSS 3.0 score is 4.8 with adjacent-network access, low complexity, high privileges required, changed scope, low confidentiality and integrity impact, and no availability impact. The source bundle does not provide vulnerable parameters, exploit details, or a CWE.

Likely exposure

Exposure is most likely where the listed NETGEAR devices remain deployed with firmware older than the fixed versions named in the CVE description. Internet exposure is not established by the provided sources; the CVSS vector indicates adjacent-network attack access.

Exploitation context

The source bundle does not show CISA KEV listing or cited active exploitation. The available evidence supports a stored XSS risk requiring high privileges and adjacent-network access, not broad unauthenticated remote exploitation.

Researcher notes

Evidence is limited to the CVE record and NETGEAR advisory reference. No CWE, exploit maturity, affected CPEs, or vulnerable field details are provided. Avoid assuming internet-reachable exploitation; CVSS indicates adjacent access and high privileges.

Mitigation direction

  • Inventory NETGEAR devices and identify exact model and firmware version.
  • Update affected devices to the fixed firmware versions listed, or later.
  • Check the NETGEAR advisory for model-specific firmware guidance.
  • Limit device management access to trusted administrative networks.
  • Replace devices if fixed firmware is unavailable from NETGEAR.

Validation and detection

  • Compare each device firmware version against the CVE fixed-version thresholds.
  • Confirm updated firmware remains installed after reboot or maintenance.
  • Verify administrative access is restricted to intended trusted networks.
  • Record model, firmware, and remediation status in asset inventory.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2018-21167 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4.8CVSS 3.0MediumCVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:N1.72.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.8Medium
CVSS 3.0 vector shape for CVE-2018-21167Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:H/S:C/UI:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.