A critical vulnerability in the FreyrSCADA IEC-60870-5-104 server allows remote attackers to disrupt system availability through memory buffer exploitation.

This flaw stems from improper restriction of operations within the bounds of a memory buffer (CWE-119), which can be triggered by an unauthenticated remote attacker sending a sequence of malformed messages to the server.

Successful exploitation of this vulnerability results in a denial of service, effectively crashing the server and rendering the affected industrial control system communication interface unavailable. Given the CVSS score of 7.5, this poses a significant risk to operational continuity, potentially causing critical downtime in environments relying on this protocol for data transmission.

Immediate Action: Since no specific patch is currently identified, administrators should restrict network access to the IEC-60870-5-104 server to trusted internal segments only, effectively isolating the service from untrusted traffic.

Proactive Monitoring: Security teams should monitor server logs for unusual message patterns or frequent service restarts that may indicate an ongoing attempt to trigger the buffer overflow.

Compensating Controls: Deploy a protocol-aware firewall or Intrusion Detection System (IDS) capable of identifying and blocking malformed IEC-60870-5-104 message sequences before they reach the server.

Public Exploit Available: Unknown.

Due to the nature of this vulnerability in an industrial protocol implementation, the risk of service disruption is high. Organizations should prioritize network-level segmentation to mitigate the exposure of the server while awaiting official vendor guidance or a formal patch release to address the underlying memory buffer management flaw.