CVE-2022-40602Network attack vector

Unauthenticated device access via pre-configured password

Published Nov 22, 2022 · Updated Apr 28, 2025

Authentication bypass in Zyxel LTE3301-M209 firmware 1.00(ABLG.4)C0 and earlier allows remote attackers to access the router. Pre-configured vendor code accepts an improper embedded password at the device's remote-management login. The flaw is reachable only after an authenticated administrator enables remote administration, and successful use grants access to the device.

CVSS severity9.8
Critical
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Zyxel LTE3301-M209 firmware 1.00(ABLG.4)C0 and earlier allows remote attackers to access the router. Pre-configured vendor code accepts an improper embedded password at the device's remote-management login. The flaw is reachable only after an authenticated administrator enables remote administration, and successful use grants access to the device.

The record

CVE
CVE-2022-40602
Published
Nov 22, 2022
Updated
Apr 28, 2025
Vendor
Zyxel Networks
Product
LTE3301-M209
Classifications
CWE-287, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< V1.00(ABLG.6)C0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zyxel Networks · LTE3301-M209version=< V1.00(ABLG.6)C0

Published CVSS scores

9.8Zyxel CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078.001Valid Accounts: Default Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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