How severe is CVE-2022-40602?

CVE-2022-40602 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-40602 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40602?

CVE-2022-40602 affects Zyxel Lte3301-m209 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-40602?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-40602 published?

CVE-2022-40602 was published on 2022-11-22 and last updated on 2026-06-17.

CVE-2022-40602

CVE-2022-40602 is a critical-severity vulnerability in Zyxel Lte3301-m209 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Zyxel Lte3301-m209 Firmware
Published: 2022-11-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2022-40602?: CVE-2022-40602 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-40602 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40602?: CVE-2022-40602 affects Zyxel Lte3301-m209 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-40602?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-40602 published?: CVE-2022-40602 was published on 2022-11-22 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-configured-password-vulnerability-of-lte3301-m209

Affected products (1)

cpe:2.3:o:zyxel:lte3301-m209_firmware:*:*:*:*:*:*:*:*

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