CVE intelligence and bounded remediation

CVE-2023-35830 — Stw-Mobile-Machines Tcg-4 Firmware security vulnerability

Critical CVSS 9.8

STW (aka Sensor-Technik Wiedemann) TCG-4 Connectivity Module DeploymentPackage_v3.03r0-Impala and DeploymentPackage_v3.04r2-Jellyfish and TCG-4lite Connectivity Module DeploymentPackage_v3.04r2-Jellyfish allow an attacker to gain full remote access with root privileges without the need for authentication, giving an attacker arbitrary remote code execution over LTE / 4G network via SMS.

Severity
Critical
CVSS
9.8 (3.1)
Published
2023-06-29
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-306

Affected products

  • stw-mobile-machines / tcg-4_firmware / 3.01r1
  • stw-mobile-machines / tcg-4_firmware / 3.02r0
  • stw-mobile-machines / tcg-4_firmware / 3.03r0
  • stw-mobile-machines / tcg-4_firmware / 3.04r2
  • stw-mobile-machines / tcg-4lite_firmware / 3.04r2

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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