What is CVE-2019-20739?

CVE-2019-20739 is a high-severity vulnerability in NETGEAR R8500, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2020-04-16.

How severe is CVE-2019-20739?

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

Buffer overflow in NETGEAR R8500

CVE-2019-20739

NETGEAR R8500 devices before v1.0.2.128 are affected by a buffer overflow by an unauthenticated attacker.

Vulnerability class: Buffer Overflow

Published 2020-04-16 · 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: 0.006 (47.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

kb.netgear.com/000061179/Security-Advisory-for-Pre-Authentication-Buffer-Overfl… (Vendor Advisory)

Frequently asked questions

What is CVE-2019-20739?: CVE-2019-20739 is a high-severity vulnerability in NETGEAR R8500, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2020-04-16.
How severe is CVE-2019-20739?: High severity. CVSS v3 base score is 8.8 out of 10.