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CVE-2021-45666

19
FAUCET Score

CVE-2021-45666 describes a stored Cross-Site Scripting (XSS) vulnerability affecting numerous NETGEAR devices, including specific versions of CBR40, EAX80, EX series extenders, and RBK/RBR/RBS series mesh Wi-Fi systems. This vulnerability carries a CVSS score of 4.8 (Medium), indicating that an attacker with high privileges could inject malicious scripts, requiring user interaction, to achieve limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE. Organizations should prioritize patching affected devices to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.1.64CPE matchmatch criteria
cpe:2.3:o:netgear:eax80_firmware:*:*:*:*:*:*:*:*
< 1.0.0.90CPE matchmatch criteria
cpe:2.3:o:netgear:ex3700_firmware:*:*:*:*:*:*:*:*
< 1.0.0.90CPE matchmatch criteria
cpe:2.3:o:netgear:ex3800_firmware:*:*:*:*:*:*:*:*
< 1.0.0.64CPE matchmatch criteria
cpe:2.3:o:netgear:ex6120_firmware:*:*:*:*:*:*:*:*
< 1.0.0.44CPE matchmatch criteria
cpe:2.3:o:netgear:ex6130_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
0.7
Impact Score
5.3
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 50th percentile among its peer group of 4,937 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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 / 000064121/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Extenders-and-WiFi-Systems-PSV-2020-0254
PatchVendor Advisory