HOMEVULNERABILITIESCVE-2018-21151
MEDIUM

CVE-2018-21151

CWE-120Published: April 22, 2020· Updated: Jun 17, 2026

6.8
CVSS v3.1

Official Description

Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects D7800 before 1.0.1.34, R7500v2 before 1.0.3.26, 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-2018-21151 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

netgear14 product(s)
d7800 firmwared7800r7500 firmwarer7500r7800 firmwarer7800r8900 firmwarer8900r9000 firmwarer9000wndr4300 firmwarewndr4300+2
Source: NVD CPE · 14 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/000059482/Security-Advisory-for-Post-Authentication-Buffer-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3154
ADVISORYhttps://kb.netgear.com/000059482/Security-Advisory-for-Post-Authentication-Buffer-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3154

All References (2)

→
https://kb.netgear.com/000059482/Security-Advisory-for-Post-Authentication-Buffer-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3154Vendor Advisory
→
https://kb.netgear.com/000059482/Security-Advisory-for-Post-Authentication-Buffer-Overflow-on-Some-Gateways-and-Routers-PSV-2017-3154Vendor Advisory

Quick Facts

CVE IDCVE-2018-21151
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedApr 22, 2020

Related CVEs (CWE-120)

CVE-2022-31481
10.0
CVE-2001-0191
10.0
CVE-2011-4862
10.0
CVE-2002-1337
10.0
CVE-1999-0046
10.0
CVE-2024-25139
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-21151 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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