Certain NETGEAR devices are affected by stored XSS.

published 2021-12-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32432

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

Certain NETGEAR devices are affected by stored XSS. This affects CBR40 before 2.5.0.10, EAX80 before 1.0.1.64, EX3700 before 1.0.0.90, EX3800 before 1.0.0.90, EX6120 before 1.0.0.64, EX6130 before 1.0.0.44, EX7500 before 1.0.0.72, RBW30 before 2.6.1.4, RBK752 before 3.2.16.6, RBR750 before 3.2.16.6, RBS750 before 3.2.16.6, RBK852 before 3.2.16.6, RBR850 before 3.2.16.6, RBS850 before 3.2.16.6, and RBS40V before 2.6.1.4.

Patch / fix

fixed in 15 links 1

netgear eax80_firmware 1.0.1.64
netgear ex3700_firmware 1.0.0.90
netgear ex3800_firmware 1.0.0.90
netgear ex6120_firmware 1.0.0.64
netgear ex6130_firmware 1.0.0.44
netgear ex7500_firmware 1.0.0.72
netgear rbw30_firmware 2.6.1.4
netgear rbk752_firmware 3.2.16.6
netgear rbr750_firmware 3.2.16.6
netgear rbs750_firmware 3.2.16.6
netgear rbk852_firmware 3.2.16.6
netgear rbr850_firmware 3.2.16.6
netgear rbs850_firmware 3.2.16.6
netgear rbs40v_firmware 2.6.1.4
netgear cbr40_firmware 2.5.0.10

kb.netgear.com/000064121/Security-Advisory-for-Stored-Cross-Site-Scriptin… advisory

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AC:H/AV:A/A:L/C:L/I:H/PR:H/S:C/UI:R
CNA	3.1	6.5	CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L
NVD	3.1	4.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

kb.netgear.com /000064121/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Extenders-and-WiFi-Systems-PSV-2020-0254
patch, vendor-advisory

Sources

CVE List CVE-2021-45666
NVD CVE-2021-45666

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary