How severe is CVE-2021-45666?

CVE-2021-45666 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2021-45666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45666?

CVE-2021-45666 primarily affects Netgear Eax80 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-45666 published?

CVE-2021-45666 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-45666

CVE-2021-45666 is a medium-severity vulnerability in Netgear Eax80 Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 3.5
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Netgear Eax80 Firmware
Published: 2021-12-26
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-45666?: 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.
How severe is CVE-2021-45666?: CVE-2021-45666 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2021-45666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45666?: CVE-2021-45666 primarily affects Netgear Eax80 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-45666 published?: CVE-2021-45666 was published on 2021-12-26 and last updated on 2026-06-17.

References

https://kb.netgear.com/000064121/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Extenders-and-WiFi-Systems-PSV-2020-0254

Affected products (15)

cpe:2.3:o:netgear:eax80_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex3700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex3800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6120_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6130_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbw30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk752_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk852_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs40v_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:cbr40_firmware:*:*:*:*:*:*:*:*

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