How severe is CVE-2022-43391?

CVE-2022-43391 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-43391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-43391?

CVE-2022-43391 primarily affects Zyxel Lte3301-plus Firmware. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-43391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-43391 published?

CVE-2022-43391 was published on 2023-01-11 and last updated on 2026-06-17.

CVE-2022-43391

CVE-2022-43391 is a medium-severity vulnerability in Zyxel Lte3301-plus Firmware with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Zyxel Lte3301-plus Firmware
Published: 2023-01-11
Last modified: 2026-06-17

Description

A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted HTTP request.

Frequently asked questions

What is CVE-2022-43391?: A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted HTTP request.
How severe is CVE-2022-43391?: CVE-2022-43391 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-43391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-43391?: CVE-2022-43391 primarily affects Zyxel Lte3301-plus Firmware. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-43391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-43391 published?: CVE-2022-43391 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 (48)

cpe:2.3:o:zyxel:lte3301-plus_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte5388-m804_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte5398-m904_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7240-m403_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7461-m602_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7480-m804_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7480-s905_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7485-s905_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:lte7490-m904_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_lte3301-plus_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_lte7461-m602_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_nr5101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nebula_nr7101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr5101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr7101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nr7102_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:dx3301-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:dx4510-b1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:dx5401-b0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg5723-t50k_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3301-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5401-b0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5501-b0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5512-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5600-t1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5601-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5601-t1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-t50k_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b50a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b60a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-t50k_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ax7501-b0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm3100-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm5100-t0_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pm7300-t0_firmware:-:*:*:*:*:*:*:*

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