What is CVE-2021-45504?

CVE-2021-45504 is a critical-severity vulnerability in NETGEAR Cbr40. CVSS score: 9.6/10. Published 2021-12-26.

How severe is CVE-2021-45504?

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

Vulnerability in NETGEAR Cbr40

CVE-2021-45504

Certain NETGEAR devices are affected by authentication bypass. This affects CBR40 before 2.5.0.24, CBR750 before 4.6.3.6, RBR852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.

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: 0.011 (65.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

References

kb.netgear.com/000064128/Security-Advisory-for-Authentication-Bypass-on-Some-Wi… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-45504?: CVE-2021-45504 is a critical-severity vulnerability in NETGEAR Cbr40. CVSS score: 9.6/10. Published 2021-12-26.
How severe is CVE-2021-45504?: Critical severity. CVSS v3 base score is 9.6 out of 10.