CVE intelligence and bounded remediation

CVE-2018-17021 — Asus Gt-Ac5300 Firmware security vulnerability

Medium CVSS 6.1

Cross-site scripting (XSS) vulnerability on ASUS GT-AC5300 devices with firmware through 3.0.0.4.384_32738 allows remote attackers to inject arbitrary web script or HTML via the appGet.cgi hook parameter.

Severity
Medium
CVSS
6.1 (3.0)
Published
2018-09-13
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-79

Affected products

  • asus / gt-ac5300_firmware

Matched remediation archetype

Cross-site scripting and unsafe browser output

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

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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