CVE-2026-89025 in Hirschmann HiOS Switch Platform
Summary
by MITRE • 09/15/2026
Hirschmann HiOS Switch Platform devices contain a denial-of-service vulnerability in the integrated web server due to missing validation of HTTP(S) content. A remote unauthenticated attacker can send a specially crafted HTTP(S) request to a specific endpoint that is processed incorrectly, causing the device to perform an unintended reboot and resulting in a temporary denial-of-service condition. This vulnerability has been addressed in versions 07.1.12, 08.7.10, 09.0.13, 09.3.03, 10.3.08, and 10.5.00.
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Analysis
by VulDB Data Team • 09/15/2026
The Hirschmann HiOS Switch Platform devices are susceptible to a critical denial-of-service vulnerability within their integrated web server component. This security flaw stems from insufficient input validation mechanisms when processing HTTP(S) content received by the device's management interface. The architecture of these industrial network switches relies heavily on the availability and integrity of the embedded web server for configuration, monitoring, and remote administration tasks. When an attacker interacts with this service without proper authentication checks or payload sanitization routines, they can exploit the lack of rigorous validation to trigger a system-level failure state.
The technical nature of this vulnerability involves sending specially crafted HTTP(S) requests to specific endpoints within the web server application logic. These malformed packets are processed incorrectly by the underlying software stack, leading to memory corruption, resource exhaustion, or an unrecoverable error condition that forces the operating system to initiate a reboot sequence. This behavior is not a standard graceful shutdown but rather an unintended crash recovery mechanism triggered by malicious input data. The absence of boundary checks and type validation on incoming HTTP headers or body content allows attackers to bypass normal operational constraints and force the device into this unstable state.
From an operational perspective, the impact of this vulnerability is significant for environments relying on continuous network availability. A remote unauthenticated attacker can exploit this flaw without needing valid credentials, lowering the barrier to entry significantly. The immediate result is a temporary denial-of-service condition as the switch reboots and services restart during the recovery process. In industrial control systems or critical infrastructure networks where Hirschmann switches are commonly deployed, such unexpected reboots can lead to network segmentation issues, loss of telemetry data, and potential disruption of automated processes that depend on stable connectivity. The transient nature of the outage means that while service is restored after reboot, repeated exploitation could cause cumulative instability or fatigue in connected systems expecting consistent uptime.
This vulnerability aligns with CWE-20 Improper Input Validation, as the core issue lies in the failure to adequately sanitize and verify incoming data before processing it within the application logic. Furthermore, from a tactical standpoint relevant to threat intelligence frameworks like MITRE ATT&CK, this exploit falls under techniques associated with Resource Hijacking or Impact categories where availability is compromised through service disruption. The unauthenticated nature of the attack also highlights risks related to CWE-862 Missing Authorization, as the system fails to verify user privileges before executing sensitive operations that lead to a reboot.
Mitigation strategies primarily involve applying the vendor-provided software updates immediately upon deployment in production environments. Official patches have been released for specific HiOS versions including 07.1.12, 08.7.10, 09.0.13, 09.3.03, 10.3.08, and 10.5.00. Organizations should prioritize upgrading affected devices to these fixed versions to eliminate the code path that allows malformed HTTP requests to trigger system reboots. In scenarios where immediate patching is not feasible due to operational constraints, temporary compensating controls such as restricting access to the web management interface via firewall rules or ACLs can reduce exposure. Limiting administrative interfaces to trusted IP ranges and disabling unnecessary services further minimizes the attack surface available to potential adversaries seeking to disrupt network availability through this specific vector.