CVE intelligence and bounded remediation

CVE-2019-13555 — Mitsubishielectric Q03/04/06/13/26Udvcpu Firmware security vulnerability

Medium CVSS 5.9

In Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU: serial number 21081 and prior, Q04/06/13/26UDPVCPU: serial number 21081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 21081 and prior, MELSEC-L Series L02/06/26CPU, L26CPU-BT: serial number 21101 and prior, L02/06/26CPU-P, L26CPU-PBT: serial number 21101 and prior, and L02/06/26CPU-CM, L26CPU-BT-CM: serial number 21101 and prior, a remote attacker can cause the FTP service to enter a denial-of-service condition dependent on the timing at which a remote attacker connects to the FTP server on the above CPU modules.

Severity
Medium
CVSS
5.9 (3.1)
Published
2019-11-13
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-400

Affected products

  • mitsubishielectric / q03/04/06/13/26udvcpu_firmware
  • mitsubishielectric / q04/06/13/26udpvcpu_firmware
  • mitsubishielectric / q03udecpu_firmware
  • mitsubishielectric / q04/06/10/13/20/26/50/100udehcpu_firmware
  • mitsubishielectric / l02/06/26cpu_firmware
  • mitsubishielectric / l26cpu-bt_firmware

Showing 6 representative product identities from 10 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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