How severe is CVE-2022-43389?

CVE-2022-43389 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2022-43389 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-43389?

CVE-2022-43389 primarily affects Zyxel Lte3202-m437 Firmware. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-43389?

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

When was CVE-2022-43389 published?

CVE-2022-43389 was published on 2023-01-11 and last updated on 2026-06-17.

CVE-2022-43389

CVE-2022-43389 is a high-severity vulnerability in Zyxel Lte3202-m437 Firmware with a CVSS 3.x base score of 8.6. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Zyxel Lte3202-m437 Firmware
Published: 2023-01-11
Last modified: 2026-06-17

Description

A buffer overflow vulnerability in the library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.

Frequently asked questions

What is CVE-2022-43389?: A buffer overflow vulnerability in the library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.
How severe is CVE-2022-43389?: CVE-2022-43389 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2022-43389 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-43389?: CVE-2022-43389 primarily affects Zyxel Lte3202-m437 Firmware. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-43389?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-43389 published?: CVE-2022-43389 was published on 2023-01-11 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-buffer-overflow-vulnerabilities-of-cpe-fiber-onts-and-wifi-extenders

Affected products (17)

cpe:2.3:o:zyxel:lte3202-m437_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte3316-m604_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7480-m804_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7490-m904_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_fwa510_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_fwa710_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_nr7101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr5103_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr5103e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr7101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr7102_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr7103_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ep240p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm7320-b0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pmg5317-t20b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pmg5617ga_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pmg5622ga_firmware:-:*:*:*:*:*:*:*

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