HOMEVULNERABILITIESCVE-2018-21123
HIGH

CVE-2018-21123

CWE-74Published: April 22, 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 WC7500 before 6.5.3.9, WC7520 before 6.5.3.9, WC7600v1 before 6.5.3.9, and WC7600v2 before 6.5.3.9.

NVD Source

Technical Analysis

CVE-2018-21123 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

netgear6 product(s)
wc7500 firmwarewc7500wc7520 firmwarewc7520wc7600 firmwarewc7600
Source: NVD CPE · 7 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/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230
ADVISORYhttps://kb.netgear.com/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230

All References (2)

→
https://kb.netgear.com/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230Vendor Advisory
→
https://kb.netgear.com/000060235/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Controllers-PSV-2018-0230Vendor Advisory

Quick Facts

CVE IDCVE-2018-21123
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedApr 22, 2020

Related CVEs (CWE-74)

CVE-2020-26282
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CVE-2023-32314
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CVE-2026-54159
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CVE-2014-8423
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CVE-2026-44182
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CVE-2024-42472
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21123 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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