CVE-2023-22921 | BDVDB-2026-201291 Detail

ZyxelNBG-418N v2 firmware

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact high. Attack vector: network.

Weaknesses#

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References#

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

Exploit#

No public exploit known

History#

Version 12023-05-01Record published in the CVE List.
Version 22025-01-30Most recent update recorded in the CVE List.

Published

Published: 2023-05-01
Last modified: 2025-01-30

Vendor information

Vendor: Zyxel
Product: NBG-418N v2 firmware

All Zyxel vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 43.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< V1.00(AARP.14)C0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.5 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	Required
Scope	Changed
Confidentiality	Low
Integrity	Low
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).