Description

IBM Reliable Scalable Cluster Technology (RSCT) 3.0 could allow a remote attacker to cause a denial of service by sending a specially crafted request due improper input validation.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-19T21:16:53.883Z",
  "pubdate": "2026-08-19T21:16:53.883Z",
  "executiveSummary": "This security analysis addresses a denial of service vulnerability affecting IBM Reliable Scalable Cluster Technology (RSCT) 3.0. The vulnerability stems from improper input validation within the processing routines of the affected product, which can be leveraged by a remote attacker to compromise system availability. By transmitting a specially crafted request to the targeted service, an unauthenticated remote adversary can trigger fatal exception handling, memory corruption, or resource exhaustion, leading to an application crash or complete service interruption of the clustering infrastructure. The risk implications are severe for environments relying on IBM RSCT for high availability, as service disruption can impact cluster heartbeat mechanisms, node monitoring, and automated failover capabilities. Exploitation requires network connectivity to the vulnerable service port exposed by IBM Reliable Scalable Cluster Technology (RSCT) 3.0. No advanced authentication or local system access is required, elevating the threat level for systems directly exposed to untrusted networks. Immediate remediation through vendor-supplied patches or strict network segmentation is strongly advised to prevent service degradation and potential operational outages.",
  "technicalDetails": "The vulnerability resides within the input parsing and validation subsystem of IBM Reliable Scalable Cluster Technology (RSCT) 3.0. Specifically, the root cause is the failure of the application to properly sanitize, bound-check, or validate incoming protocol data structures before passing them to internal processing functions. When a remote attacker transmits a specially crafted request over the network, the vulnerable component attempts to process the malformed input without adequate error handling or structural verification.\nThe attack flow begins with the attacker establishing network communication with the targeted IBM Reliable Scalable Cluster Technology (RSCT) 3.0 daemon or service listening on its designated port. The attacker then constructs a malicious payload designed to exploit the input validation flaw—potentially containing oversized fields, unexpected data types, or recursive structures that violate the expected protocol specification. Upon reception, the vulnerable parsing routine ingests the payload. Due to the absence of rigorous input validation, the malformed data induces an abnormal program state, such as an out-of-bounds read, null pointer dereference, integer overflow, or unhandled exception.\nThis anomalous state precipitates an immediate crash of the daemon or service, resulting in a denial of service condition. Because IBM Reliable Scalable Cluster Technology (RSCT) 3.0 operates at a foundational level to manage cluster resources, nodes, and high-availability monitoring, the termination of the core service disrupts critical inter-node communications and cluster management operations. The vulnerability is exploitable remotely over the network without requiring prior authentication or specific user privileges, representing a significant threat vector for exposed cluster management interfaces. Post-exploitation impact is limited to availability disruption; however, the resulting service outage can impair cluster resilience and automated failover mechanisms."
}