CVE intelligence and bounded remediation

CVE-2020-9436 — Phoenixcontact Tc Router 3002T-4G Firmware security vulnerability

High CVSS 9

PHOENIX CONTACT TC ROUTER 3002T-4G through 2.05.3, TC ROUTER 2002T-3G through 2.05.3, TC ROUTER 3002T-4G VZW through 2.05.3, TC ROUTER 3002T-4G ATT through 2.05.3, TC CLOUD CLIENT 1002-4G through 2.03.17, and TC CLOUD CLIENT 1002-TXTX through 1.03.17 devices allow authenticated users to inject system commands through a modified POST request to a specific URL.

Severity
High
CVSS
9 (2.0)
Published
2020-03-12
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-78

Affected products

  • phoenixcontact / tc_router_3002t-4g_firmware
  • phoenixcontact / tc_router_2002t-3g_firmware
  • phoenixcontact / tc_router_3002t-4g_vzw_firmware
  • phoenixcontact / tc_router_3002t-4g_att_firmware
  • phoenixcontact / tc_cloud_client_1002-4g_firmware
  • phoenixcontact / tc_cloud_client_1002-txtx_firmware

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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