CVE intelligence and bounded remediation

CVE-2020-7486 — Schneider-Electric Tricon Tcm 4351 Firmware security vulnerability

High CVSS 7.5

**VERSION NOT SUPPORTED WHEN ASSIGNED** A vulnerability could cause TCM modules to reset when under high network load in TCM v10.4.x and in system v10.3.x. This vulnerability was discovered and remediated in version v10.5.x on August 13, 2009. TCMs from v10.5.x and on will no longer exhibit this behavior.

Severity
High
CVSS
7.5 (3.1)
Published
2020-04-16
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-400

Affected products

  • schneider-electric / tricon_tcm_4351_firmware / 10.3.x
  • schneider-electric / tricon_tcm_4351_firmware / 10.4.x
  • schneider-electric / tricon_tcm_4352_firmware / 10.3.x
  • schneider-electric / tricon_tcm_4352_firmware / 10.4.x
  • schneider-electric / tricon_tcm_4351a_firmware / 10.3.x
  • schneider-electric / tricon_tcm_4351a_firmware / 10.4.x

Showing 6 representative product identities from 12 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

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

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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