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CVE-2018-21093

27
FAUCET Score

CVE-2018-21093 describes a stack-based buffer overflow vulnerability impacting numerous NETGEAR devices, including various D8500, EX, R, RBW, WN, and WNR series models. An unauthenticated attacker can exploit this flaw over the network. With a CVSS score of 8.8 (High), successful exploitation could lead to complete compromise of confidentiality, integrity, and availability of the affected device. While no public exploit code (Metasploit, Nuclei, ExploitDB) or active exploitation has been observed, and community discussion is minimal, the high severity warrants patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.3.42CPE matchmatch criteria
cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:*
< 1.0.0.70CPE matchmatch criteria
cpe:2.3:o:netgear:ex3700_firmware:*:*:*:*:*:*:*:*
< 1.0.0.70CPE matchmatch criteria
cpe:2.3:o:netgear:ex3800_firmware:*:*:*:*:*:*:*:*
< 1.0.0.30CPE matchmatch criteria
cpe:2.3:o:netgear:ex6000_firmware:*:*:*:*:*:*:*:*
< 1.0.2.24CPE matchmatch criteria
cpe:2.3:o:netgear:ex6100_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.4MEDIUM

CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
0.9
Impact Score
5.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.63%
Probability of exploitation in next 30 days
EPSS Percentile
46.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0063 is in the 48th percentile among its peer group of 1,859 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

kb.netgear.com / 000060456/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-Some-Routers-Modem-Routers-Wireless-Extenders-and-Orbi-Satellites-PSV-2017-2011
Vendor Advisory