CVE-2018-21231

Adjacent data disclosure and modification

Published Apr 24, 2020 · Updated Aug 5, 2024

Security misconfiguration in NETGEAR router, gateway, and extender firmware allows adjacent attackers to read or alter protected data. NETGEAR has not published the affected setting, interface, or operation, so the precise mechanism and attacker-controlled input remain undisclosed. Exploitation requires an adjacent position and user interaction; reported impact is limited to confidentiality and integrity, with no service interruption.

CVSS severity5.2
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security misconfiguration in NETGEAR router, gateway, and extender firmware allows adjacent attackers to read or alter protected data. NETGEAR has not published the affected setting, interface, or operation, so the precise mechanism and attacker-controlled input remain undisclosed. Exploitation requires an adjacent position and user interaction; reported impact is limited to confidentiality and integrity, with no service interruption.

The record

CVE
CVE-2018-21231
Published
Apr 24, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.2NETGEARCVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
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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