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CVE-2018-21121

26
FAUCET Score

CVE-2018-21121 describes an authentication bypass vulnerability affecting specific NETGEAR devices, including GS810EMX (firmware before 1.0.0.5), XS512EM (firmware before 1.0.0.6), and XS724EM (firmware before 1.0.0.6). This vulnerability carries a high CVSS score of 8.8, indicating a critical risk due to its low attack complexity, requiring no user interaction, and allowing for complete compromise of confidentiality, integrity, and availability over an adjacent network. There is currently no evidence of active exploitation, publicly available exploit code in Metasploit or Nuclei, nor significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.0.5CPE matchmatch criteria
cpe:2.3:o:netgear:gs810emx_firmware:*:*:*:*:*:*:*:*
< 1.0.0.6CPE matchmatch criteria
cpe:2.3:o:netgear:xs512em_firmware:*:*:*:*:*:*:*:*
< 1.0.0.6CPE matchmatch criteria
cpe:2.3:o:netgear:xs724em_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 53rd percentile among its peer group of 1,875 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 / 000060237/Security-Advisory-for-Authentication-Bypass-on-Some-Switches-PSV-2018-0219
Vendor Advisory