Description

A denial-of-service vulnerability exists in the API of HPE Networking Fabric Composer that could allow an authenticated low privilege operator user to cause a denial of service. Successful exploitation could allow an attacker to interrupt the normal operation of the affected service.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "3.1",
  "pubDate": "2026-09-01T20:17:22.333Z",
  "pubdate": "2026-09-01T20:17:22.333Z",
  "executiveSummary": "A denial-of-service (DoS) vulnerability has been identified within the API of HPE Networking Fabric Composer. The vulnerability permits an authenticated operator with low-level privileges to disrupt the availability and operational integrity of the service.\nThe flaw stems from insufficient input validation or resource management within the API endpoints. By exploiting this weakness, a malicious actor can trigger a service interruption, preventing authorized users from accessing or managing the fabric configuration.\nThis vulnerability poses a significant risk to network availability, as HPE Networking Fabric Composer is critical for the orchestration and management of data center network fabrics. The requirement for authenticated access restricts the threat surface to internal or authorized users, but the potential for malicious insiders or compromised operator accounts remains a primary concern.\nSuccessful exploitation results in the degradation or total cessation of service, impacting the management layer of the networking infrastructure without necessarily requiring high-level administrative credentials. Remediation is essential to maintain business continuity and prevent unauthorized service disruption.",
  "technicalDetails": "The vulnerability resides within the API request handling logic of HPE Networking Fabric Composer, which fails to adequately sanitize or limit the processing of specific API calls when executed by a low-privilege operator account.\nThe root cause is identified as an improper resource management mechanism, where an attacker can submit malformed or excessively intensive requests to the API. When the backend service processes these specific payloads, it triggers a resource exhaustion state—likely involving CPU spikes, memory saturation, or thread exhaustion—leading to the service becoming unresponsive.\nExploitation requires the attacker to hold valid, low-privilege operator credentials. Once authenticated, the attacker interacts with the API endpoints responsible for querying, updating, or configuring network fabric parameters. By crafting specific, resource-heavy API requests, the attacker bypasses standard operational limits. The attack flow involves the following sequence: First, the attacker establishes a session via the authenticated API gateway. Second, the attacker systematically probes the API to identify endpoints that perform heavy state processing or complex lookups. Third, the attacker initiates a flood or a single, highly taxing request sequence to the vulnerable endpoint. Finally, the service fails to manage the resulting queue or memory allocation, leading to a crash or a permanent hang of the service process.\nBecause the vulnerability exists at the API layer, it is exposed to any interface capable of making authenticated requests to the Fabric Composer. The post-exploitation impact is a denial of service, where the management plane becomes unreachable. This forces an manual intervention, such as a process restart or a full system reboot, to restore normal functionality. No unauthorized data exfiltration is required to achieve the DoS effect, as the focus is on the interruption of the service state.\nThe lack of robust rate limiting and input validation at the API gateway level allows even accounts with restricted permissions to influence the stability of the core management engine. The vulnerability underscores the necessity for rigorous API security controls, particularly regarding request validation and resource quota enforcement for all authenticated entities, regardless of their privilege level."
}