CVE intelligence and bounded remediation

CVE-2023-39239 — It is identified a format string vulnerability in ASUS RT-AX56U V2’s General function API

High CVSS 7.2

It is identified a format string vulnerability in ASUS RT-AX56U V2’s General function API. This vulnerability is caused by lacking validation for a specific value within its apply.cgi module. A remote attacker with administrator privilege can exploit this vulnerability to perform remote arbitrary code execution, arbitrary system operation or disrupt service.

Severity
High
CVSS
7.2 (3.1)
Published
2023-09-07
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-134

Affected products

  • asus / rt-ax55_firmware / 3.0.0.4.386_50460
  • asus / rt-ax56u_v2_firmware / 3.0.0.4.386_50460
  • asus / rt-ac86u_firmware / 3.0.0.4_386_51529

Matched remediation archetype

Command, code, expression, and template injection

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

Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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