CVE intelligence and bounded remediation

CVE-2021-38412 — Digi Portserver Ts 16 Firmware security vulnerability

Critical CVSS 9.8

Properly formatted POST requests to multiple resources on the HTTP and HTTPS web servers of the Digi PortServer TS 16 Rack device do not require authentication or authentication tokens. This vulnerability could allow an attacker to enable the SNMP service and manipulate the community strings to achieve further control in.

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-09-17
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287, CWE-306

Affected products

  • digi / portserver_ts_16_firmware / 82000684
  • digi / portserver_ts_16_firmware / 82000685

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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