What is CVE-2021-45523?

CVE-2021-45523 is a medium-severity vulnerability in NETGEAR R7000, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.7/10. Published 2021-12-26.

How severe is CVE-2021-45523?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Buffer overflow in NETGEAR R7000

CVE-2021-45523

NETGEAR R7000 devices before 1.0.9.42 are affected by a buffer overflow by an authenticated user.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

kb.netgear.com/000064442/Security-Advisory-for-Post-Authentication-Buffer-Overf… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-45523?: CVE-2021-45523 is a medium-severity vulnerability in NETGEAR R7000, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.7/10. Published 2021-12-26.
How severe is CVE-2021-45523?: Medium severity. CVSS v3 base score is 5.7 out of 10.