HOMEVULNERABILITIESCVE-2018-21146
MEDIUM

CVE-2018-21146

CWE-74Published: April 21, 2020· Updated: Jun 17, 2026

6.8
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects D7800 before 1.0.1.34, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR4300v2 before 1.0.0.54, and WNDR4500v3 before 1.0.0.54.

NVD Source

Technical Analysis

CVE-2018-21146 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

netgear12 product(s)
d7800 firmwared7800r7800 firmwarer7800r8900 firmwarer8900r9000 firmwarer9000wndr4300 firmwarewndr4300wndr4500 firmwarewndr4500
Source: NVD CPE · 12 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/000059487/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Gateways-and-Routers-PSV-2017-3159
ADVISORYhttps://kb.netgear.com/000059487/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Gateways-and-Routers-PSV-2017-3159

All References (2)

→
https://kb.netgear.com/000059487/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Gateways-and-Routers-PSV-2017-3159Vendor Advisory
→
https://kb.netgear.com/000059487/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Gateways-and-Routers-PSV-2017-3159Vendor Advisory

Quick Facts

CVE IDCVE-2018-21146
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedApr 21, 2020

Related CVEs (CWE-74)

CVE-2025-20265
10.0
CVE-2024-42472
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CVE-2026-44182
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CVE-2022-24760
10.0
CVE-2023-30547
10.0
CVE-2026-54159
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21146 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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