HOMEVULNERABILITIESCVE-2018-21208
HIGH

CVE-2018-21208

CWE-74Published: April 28, 2020· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D6100 before 1.0.0.57, R6100 before 1.0.1.20, R7500v2 before 1.0.3.24, WNDR4300v2 before 1.0.0.50, and WNDR4500v3 before 1.0.0.50.

NVD Source

Technical Analysis

CVE-2018-21208 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

netgear10 product(s)
d6100 firmwared6100r6100 firmwarer6100r7500 firmwarer7500wndr4300 firmwarewndr4300wndr4500 firmwarewndr4500
Source: NVD CPE · 10 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/000055141/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-and-Gateways-PSV-2017-2516
ADVISORYhttps://kb.netgear.com/000055141/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-and-Gateways-PSV-2017-2516

All References (2)

→
https://kb.netgear.com/000055141/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-and-Gateways-PSV-2017-2516Vendor Advisory
→
https://kb.netgear.com/000055141/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-and-Gateways-PSV-2017-2516Vendor Advisory

Quick Facts

CVE IDCVE-2018-21208
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedApr 28, 2020

Related CVEs (CWE-74)

CVE-2026-44182
10.0
CVE-2023-30547
10.0
CVE-2020-26282
10.0
CVE-2026-56699
10.0
CVE-2024-38366
10.0
CVE-2022-24760
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21208 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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