HOMEVULNERABILITIESCVE-2018-21141
MEDIUM

CVE-2018-21141

CWE-20Published: April 21, 2020· Updated: Jun 17, 2026

4.5
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by denial of service. This affects R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.54, WNDR4500v3 before 1.0.0.54, and WNR2000v5 before 1.0.0.64.

NVD Source

Technical Analysis

CVE-2018-21141 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

netgear18 product(s)
r6100 firmwarer6100r7500 firmwarer7500r7800 firmwarer7800r8900 firmwarer8900r9000 firmwarer9000wndr3700 firmwarewndr3700+6
Source: NVD CPE · 19 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://kb.netgear.com/000059492/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3168
ADVISORYhttps://kb.netgear.com/000059492/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3168

All References (2)

→
https://kb.netgear.com/000059492/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3168Vendor Advisory
→
https://kb.netgear.com/000059492/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3168Vendor Advisory

Quick Facts

CVE IDCVE-2018-21141
CVSS Score4.5 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 21, 2020

Related CVEs (CWE-20)

CVE-2023-41917
10.0
CVE-2009-0545
10.0
CVE-2017-10918
10.0
CVE-2020-13753
10.0
CVE-2025-23202
10.0
CVE-2011-0923
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21141 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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