HOMEVULNERABILITIESCVE-2018-21142
MEDIUM

CVE-2018-21142

NVD-CWE-noinfoPublished: April 23, 2020· Updated: Jun 17, 2026

4.9
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-2018-21142 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 4.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/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/000059491/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3169
ADVISORYhttps://kb.netgear.com/000059491/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3169

All References (2)

→
https://kb.netgear.com/000059491/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3169Vendor Advisory
→
https://kb.netgear.com/000059491/Security-Advisory-for-Denial-of-Service-on-Some-Routers-PSV-2017-3169Vendor Advisory

Quick Facts

CVE IDCVE-2018-21142
CVSS Score4.9 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedApr 23, 2020

Related CVEs (NVD-CWE-noinfo)

CVE-2017-14471
10.0
CVE-2017-14470
10.0
CVE-2018-4872
10.0
CVE-2018-4091
10.0
CVE-2017-14469
10.0
CVE-2017-14472
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21142 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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