CVE-2018-21172

Authenticated memory corruption via stack buffer overflow

Published Apr 27, 2020 · Updated Aug 5, 2024

Stack-based buffer overflow in NETGEAR router firmware allows remote authenticated users on an adjacent network to cause unspecified impact. NETGEAR has not disclosed the affected component, input field, or operation that writes beyond the stack buffer. Reaching the flaw requires high-privilege authentication and adjacent-network access; published sources do not distinguish between device crashes and code execution.

CVSS severity6.8
Medium
EPSS probability0.59%
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 firmware allows remote authenticated users on an adjacent network to cause unspecified impact. NETGEAR has not disclosed the affected component, input field, or operation that writes beyond the stack buffer. Reaching the flaw requires high-privilege authentication and adjacent-network access; published sources do not distinguish between device crashes and code execution.

The record

CVE
CVE-2018-21172
Published
Apr 27, 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 27, 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

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

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

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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