What is CVE-2021-38522?

CVE-2021-38522 is a medium-severity vulnerability in NETGEAR R6400, classified under Out-of-bounds Write. CVSS score: 6.8/10. Published 2021-08-11.

How severe is CVE-2021-38522?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Buffer overflow in NETGEAR R6400

CVE-2021-38522

NETGEAR R6400 devices before 1.0.1.52 are affected by a stack-based buffer overflow by an authenticated user.

Vulnerability class: Buffer Overflow

Published 2021-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.7th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

kb.netgear.com/000063767/Security-Advisory-for-Post-Authentication-Stack-Overfl… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-38522?: CVE-2021-38522 is a medium-severity vulnerability in NETGEAR R6400, classified under Out-of-bounds Write. CVSS score: 6.8/10. Published 2021-08-11.
How severe is CVE-2021-38522?: Medium severity. CVSS v3 base score is 6.8 out of 10.