How severe is CVE-2021-45521?

CVE-2021-45521 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-45521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45521?

CVE-2021-45521 primarily affects Netgear Rbk352 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45521?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-45521 published?

CVE-2021-45521 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-45521

CVE-2021-45521 is a high-severity vulnerability in Netgear Rbk352 Firmware with a CVSS 3.x base score of 7.4. 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-798.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 3.3
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Netgear Rbk352 Firmware
Published: 2021-12-26
Last modified: 2026-06-17

Description

Certain NETGEAR devices are affected by a hardcoded password. This affects RBK352 before 4.4.0.10, RBR350 before 4.4.0.10, and RBS350 before 4.4.0.10.

Frequently asked questions

What is CVE-2021-45521?: Certain NETGEAR devices are affected by a hardcoded password. This affects RBK352 before 4.4.0.10, RBR350 before 4.4.0.10, and RBS350 before 4.4.0.10.
How severe is CVE-2021-45521?: CVE-2021-45521 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-45521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45521?: CVE-2021-45521 primarily affects Netgear Rbk352 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-45521 published?: CVE-2021-45521 was published on 2021-12-26 and last updated on 2026-06-17.

References

https://kb.netgear.com/000064161/Security-Advisory-for-Hardcoded-Password-on-Some-WiFi-Systems-PSV-2021-0045

Affected products (3)

cpe:2.3:o:netgear:rbk352_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr350_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs350_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear Rbk352 Firmware

CVE-2021-45652 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by disclosure of sensitive information. This affects RBK352 before 4.4.0.10,…
CVE-2021-45619 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects EX6200v2 before…
CVE-2021-45520 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by a hardcoded password. This affects RBK352 before 4.4.0.10, RBR350 before…
CVE-2021-45494 — High (CVSS 8.4): Certain NETGEAR devices are affected by an attacker's ability to read arbitrary files. This affects RBK352 before…
CVE-2021-45653 — Low (CVSS 3.9): Certain NETGEAR devices are affected by disclosure of sensitive information. This affects RBK352 before 4.4.0.10,…
CVE-2021-45648 — Low (CVSS 3.1): Certain NETGEAR devices are affected by disclosure of sensitive information. This affects EX6100v2 before 1.0.1.106,…

All CVEs affecting Netgear Rbk352 Firmware →

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