CVE intelligence and bounded remediation

CVE-2020-5634 — Elecom Wrc-2533Gst2 Firmware security vulnerability

High CVSS 8.8

ELECOM LAN routers (WRC-2533GST2 firmware versions prior to v1.14, WRC-1900GST2 firmware versions prior to v1.14, WRC-1750GST2 firmware versions prior to v1.14, and WRC-1167GST2 firmware versions prior to v1.10) allow an attacker on the same network segment to execute arbitrary OS commands with a root privilege via unspecified vectors.

Severity
High
CVSS
8.8 (3.1)
Published
2020-10-06
CISA KEV
Not currently listed
Ecosystem
operating-system

Affected products

  • elecom / wrc-2533gst2_firmware
  • elecom / wrc-1900gst2_firmware
  • elecom / wrc-1750gst2_firmware
  • elecom / wrc-1167gst2_firmware

Matched remediation archetype

Command, code, expression, and template injection

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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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