How severe is CVE-2023-22922?

CVE-2023-22922 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-22922 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22922?

CVE-2023-22922 affects Zyxel Nbg-418n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-22922?

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-2023-22922 published?

CVE-2023-22922 was published on 2023-05-01 and last updated on 2026-06-17.

CVE-2023-22922

CVE-2023-22922 is a high-severity vulnerability in Zyxel Nbg-418n Firmware with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Zyxel Nbg-418n Firmware
Published: 2023-05-01
Last modified: 2026-06-17

Description

A buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote unauthenticated attacker to cause DoS conditions by sending crafted packets if Telnet is enabled on a vulnerable device.

Frequently asked questions

What is CVE-2023-22922?: A buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote unauthenticated attacker to cause DoS conditions by sending crafted packets if Telnet is enabled on a vulnerable device.
How severe is CVE-2023-22922?: CVE-2023-22922 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-22922 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22922?: CVE-2023-22922 affects Zyxel Nbg-418n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-22922?: 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-2023-22922 published?: CVE-2023-22922 was published on 2023-05-01 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nbg-418n-v2-home-router

Affected products (1)

cpe:2.3:o:zyxel:nbg-418n_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Nbg-418n Firmware

CVE-2019-6710 — High (CVSS 8.8): Zyxel NBG-418N v2 v1.00(AAXM.4)C0 devices allow login.cgi CSRF.
CVE-2015-7283 — High (CVSS 8.1): The web administration interface on ZyXEL NBG-418N devices with firmware 1.00(AADZ.3)C0 has a default password of 1234…
CVE-2015-7284 — High (CVSS 8.0): Cross-site request forgery (CSRF) vulnerability on ZyXEL NBG-418N devices with firmware 1.00(AADZ.3)C0 allows remote…
CVE-2023-22921 — High (CVSS 7.5): A cross-site scripting (XSS) vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could…
CVE-2023-22923 — Medium (CVSS 6.5): A format string vulnerability in a binary of the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could…
CVE-2022-45441 — Medium (CVSS 6.1): A cross-site scripting (XSS) vulnerability in Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.13)C0, which…

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