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Vulnerability record · CVE-2023-22921 · published 1 May 2023

CVE-2023-22921: Zyxel nbg-418n firmware cross-site scripting vulnerability

Zyxel · Nbg 418n Firmware

A cross-site scripting (XSS) vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote authenticated attacker with administrator privileges to store malicious scripts using a web management interface parameter, resulting in denial-of-service (DoS) conditions on an affected device.

7.5 CVSS 3.1 High EPSS 0.50% · top 59.5% CWE-79 · Cross-site scripting
7.5CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A cross-site scripting (XSS) vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote authenticated attacker with administrator privileges to store malicious scripts using a web management interface parameter, resulting in denial-of-service (DoS) conditions on an affected device.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nbg- PatchVendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nbg- PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2019-6710Zyxel nbg-418n firmware cross-site request forgery vulnerabilityZyxel NBG-418N v2 v1.00(AAXM.4)C0 devices allow login.cgi CSRF.EPSS 3.0%8.1CVE-2015-7283Zyxel nbg-418n firmware vulnerabilityThe web administration interface on ZyXEL NBG-418N devices with firmware 1.00(AADZ.3)C0 has a default password of 1234 for the admin account, which a…EPSS 3.7%8.0CVE-2015-7284Zyxel nbg-418n firmware cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability on ZyXEL NBG-418N devices with firmware 1.00(AADZ.3)C0 allows remote attackers to hijack the authenti…EPSS 1.1%7.5CVE-2023-22922Zyxel nbg-418n firmware classic buffer overflow vulnerabilityA 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…EPSS 0.93%6.5CVE-2023-22923Zyxel nbg-418n firmware vulnerabilityA format string vulnerability in a binary of the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote authenticated att…EPSS 0.79%6.1CVE-2022-45441Zyxel nbg-418n firmware cross-site scripting vulnerabilityA cross-site scripting (XSS) vulnerability in Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.13)C0, which could allow an attacker to store m…EPSS 0.35%4.9CVE-2023-22924Zyxel nbg-418n firmware classic buffer overflow vulnerabilityA buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote authenticated attacker with…EPSS 0.80%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed

Source: NIST National Vulnerability Database (record CVE-2023-22921), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.