What is CVE-2026-33366?

CVE-2026-33366 is a medium-severity vulnerability in Buffalo Inc. Wi-fi Router Products, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-03-27.

How severe is CVE-2026-33366?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Buffalo Inc. Wi-fi Router Products

CVE-2026-33366

Missing authentication for critical function vulnerability in BUFFALO Wi-Fi router products may allow an attacker to forcibly reboot the product without authentication.

Vulnerability class: Broken Authentication

EPSS: 0.002 (35.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Buffalo Inc. Wi-fi Router Products — versions See "References" section

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.buffalo.jp/news/detail/20260323-01.html
jvn.jp/en/jp/JVN83788689/

Frequently asked questions

What is CVE-2026-33366?: CVE-2026-33366 is a medium-severity vulnerability in Buffalo Inc. Wi-fi Router Products, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-03-27.
How severe is CVE-2026-33366?: Medium severity. CVSS v3 base score is 5.3 out of 10.