What is CVE-2021-45520?

CVE-2021-45520 is a critical-severity vulnerability in NETGEAR Rbk352, classified under Use of Hard-coded Credentials. CVSS score: 9.6/10. Published 2021-12-26.

How severe is CVE-2021-45520?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in NETGEAR Rbk352

CVE-2021-45520

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.

Published 2021-12-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

kb.netgear.com/000064151/Security-Advisory-for-Hardcoded-Password-on-Some-WiFi-… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-45520?: CVE-2021-45520 is a critical-severity vulnerability in NETGEAR Rbk352, classified under Use of Hard-coded Credentials. CVSS score: 9.6/10. Published 2021-12-26.
How severe is CVE-2021-45520?: Critical severity. CVSS v3 base score is 9.6 out of 10.