CVE‑2025‑48927: TeleMessage TM SGNL Insecure Default – Exposed Spring Boot Actuator Heap Dump Endpoint
What It Is – TeleMessage TM SGNL ships with a Spring Boot Actuator configuration that enables the /heapdump URI by default. The endpoint returns a full JVM heap dump without authentication, exposing potentially sensitive in‑memory data.
Exploitability – No public exploit code is required; an unauthenticated network request to the endpoint can retrieve the dump. The vulnerability is rated CVSS 7.5 (HIGH).
Affected Products – TeleMessage TM SGNL (all versions prior to the vendor‑issued fix).
Why It Matters for Trust & Control Assurance
- Configuration Management – Default‑enabled diagnostic endpoints violate the control objective of hardening system configurations and disabling unnecessary services.
- Evidence of Due Diligence – Continuous monitoring that flags insecure defaults provides audit‑ready evidence that the organization enforces secure baselines.
- Defensible Audit Trail – Remediation (disabling the endpoint, documenting the change) creates a traceable control activity that satisfies multiple frameworks (e.g., NIST CSF 2.0, ISO 27001).
Recommended Actions
- Identify all TM SGNL instances and verify whether the
/heapdumpendpoint is reachable. - Disable the Actuator’s heap‑dump exposure via configuration (
management.endpoint.heapdump.enabled=false) or network segmentation. - Apply TeleMessage’s latest security patch that removes the insecure default.
- Update your secure‑configuration baseline and incorporate the change into automated compliance scans.
- Capture remediation evidence (config snapshots, scan results) and map it to the “secure configuration management” control objective.
Source: CISA KEV – CVE‑2025‑48927