CVE-2018-21142

Service interruption via undisclosed firmware mechanism

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 exhausts resources or stops processing. Exploitation requires high privileges and adjacent-network access; no data disclosure or modification is reported.

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 exhausts resources or stops processing. Exploitation requires high privileges and adjacent-network access; no data disclosure or modification is reported.

The record

CVE
CVE-2018-21142
Published
Apr 23, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
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

4.5NETGEARCVSS: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
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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