CVE-2018-21166

Service interruption

Published Apr 23, 2020 · Updated Aug 5, 2024

Denial of service in affected NETGEAR router firmware allows remote authenticated users on an adjacent network to interrupt service. NETGEAR has not published the affected component, triggering input, or operation that causes the denial of service. Administrative privileges are required, and the documented impact is limited to availability; the public record does not distinguish a hang, crash, or reboot.

CVSS severity4.5
Medium
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected NETGEAR router firmware allows remote authenticated users on an adjacent network to interrupt service. NETGEAR has not published the affected component, triggering input, or operation that causes the denial of service. Administrative privileges are required, and the documented impact is limited to availability; the public record does not distinguish a hang, crash, or reboot.

The record

CVE
CVE-2018-21166
Published
Apr 23, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Apr 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
4.5NETGEARCVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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