CVE intelligence and bounded remediation

CVE-2021-46387 — ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS)

Medium CVSS 6.1

ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by Cross Site Scripting (XSS). Insecure URI handling leads to bypass security restriction to achieve Cross Site Scripting, which allows an attacker able to execute arbitrary JavaScript codes to perform multiple attacks such as clipboard hijacking and session hijacking.

Severity
Medium
CVSS
6.1 (3.1)
Published
2022-03-01
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-79

Affected products

  • zyxel / zywall_2_plus_internet_security_appliance_firmware

Matched remediation archetype

Cross-site scripting and unsafe browser output

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Check exposure

  • Trace reflected, stored, and DOM-derived untrusted values into HTML, attributes, URLs, styles, scripts, and client-side template sinks.
  • Identify affected origins, authenticated user roles, sensitive browser capabilities, and where content is shared across tenants.
  • Review framework escaping, rich-text sanitization, legacy templates, and client-side rendering paths.

Remediate safely

  • Use context-aware framework output encoding and safe DOM APIs; keep untrusted data out of executable contexts.
  • Sanitize intentionally supported markup with a maintained allowlist policy and validate URLs and attributes separately.
  • Update affected rendering components and add tests for every output context using inert sentinel markup.

Authoritative sources

Complete CVE record and remediation plan

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