What is CVE-2022-40602?

CVE-2022-40602 is a critical-severity vulnerability in Zyxel Lte3301-M209, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-11-22.

How severe is CVE-2022-40602?

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

Auth bypass in Zyxel Lte3301-M209

CVE-2022-40602

A flaw in the Zyxel LTE3301-M209 firmware verisons prior to V1.00(ABLG.6)C0 could allow a remote attacker to access the device using an improper pre-configured password if the remote administration feature has been enabled by an authenticated administrator.

Vulnerability class: Broken Authentication

Published 2022-11-22 · 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 (63.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.000

Affected products

Zyxel Lte3301-M209 — versions < V1.00(ABLG.6)C0
Zyxel Lte3301-M209 Firmware

Weakness classification (CWE)

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2022-40602?: CVE-2022-40602 is a critical-severity vulnerability in Zyxel Lte3301-M209, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-11-22.
How severe is CVE-2022-40602?: Critical severity. CVSS v3 base score is 9.8 out of 10.