CVE intelligence and bounded remediation

CVE-2020-6983 — Moxa Pt-7528-24Tx-Hv Firmware security vulnerability

High CVSS 7.5

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, the affected products use a hard-coded cryptographic key, which increases the possibility that confidential data can be recovered.

Severity
High
CVSS
7.5 (3.1)
Published
2020-03-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-321, CWE-798

Affected products

  • moxa / pt-7528-24tx-hv_firmware
  • moxa / pt-7528-24tx-hv-hv_firmware
  • moxa / pt-7528-24tx-wv_firmware
  • moxa / pt-7528-24tx-wv-hv_firmware
  • moxa / pt-7528-24tx-wv-wv_firmware
  • moxa / pt-7528-12msc-12tx-4gsfp-hv_firmware

Showing 6 representative product identities from 55 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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