CVE-2018-21194

Authenticated memory corruption via stack buffer overflow

Published Apr 28, 2020 · Updated Aug 5, 2024

Stack-based buffer overflow in NETGEAR router and gateway firmware allows remote authenticated users to corrupt memory over an adjacent network. NETGEAR has not disclosed the affected function, input field, or unsafe operation that overruns the stack buffer. Administrative access and proximity to the device's network segment are required; successful exploitation can compromise the device.

CVSS severity6.8
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in NETGEAR router and gateway firmware allows remote authenticated users to corrupt memory over an adjacent network. NETGEAR has not disclosed the affected function, input field, or unsafe operation that overruns the stack buffer. Administrative access and proximity to the device's network segment are required; successful exploitation can compromise the device.

The record

CVE
CVE-2018-21194
Published
Apr 28, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Apr 28, 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

6.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
5.2NIST NVDAV:A/AC:L/Au:S/C:P/I:P/A:P
6.8NETGEARCVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/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

CWE-787Out-of-bounds Write

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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