What is CVE-2023-36187?

CVE-2023-36187 is a critical-severity vulnerability in NETGEAR Cbr40, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-09-01.

How severe is CVE-2023-36187?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in NETGEAR Cbr40

CVE-2023-36187

Buffer Overflow vulnerability in NETGEAR R6400v2 before version 1.0.4.118, allows remote unauthenticated attackers to execute arbitrary code via crafted URL to httpd.

Vulnerability class: Buffer Overflow

Published 2023-09-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.011 · change: +0.002

Affected products

Weakness classification (CWE)

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

References

kb.netgear.com/000065571/Security-Advisory-for-Pre-Authentication-Buffer-Overfl… (Vendor Advisory)

Frequently asked questions

What is CVE-2023-36187?: CVE-2023-36187 is a critical-severity vulnerability in NETGEAR Cbr40, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-09-01.
How severe is CVE-2023-36187?: Critical severity. CVSS v3 base score is 9.8 out of 10.