What is CVE-2018-21217?

CVE-2018-21217 is a high-severity vulnerability in NETGEAR D3600, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2020-04-28.

How severe is CVE-2018-21217?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in NETGEAR D3600

CVE-2018-21217

Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before 1.0.0.67, D6000 before 1.0.0.67, D6100 before 1.0.0.56, and R6100 before 1.0.1.20.

Vulnerability class: Buffer Overflow

Published 2020-04-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

kb.netgear.com/000055120/Security-Advisory-for-Pre-Authentication-Buffer-Overfl… (Vendor Advisory)

Frequently asked questions

What is CVE-2018-21217?: CVE-2018-21217 is a high-severity vulnerability in NETGEAR D3600, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2020-04-28.
How severe is CVE-2018-21217?: High severity. CVSS v3 base score is 8.8 out of 10.