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CVE-2026-89025 – Unauthenticated Denial-of-Service (Device Reboot) – Hirschmann HiOS Switch Platform

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Summary

CVE-2026-89025 is a denial-of-service vulnerability in the integrated web server of the Hirschmann HiOS Switch Platform, caused by missing validation of HTTP(S) request content. An unauthenticated remote attacker can send a specially crafted HTTP(S) request to trigger an unintended device reboot, temporarily disrupting network operations. The vulnerability carries a high severity rating (CVSS 8.7).

Technical details

  • Root cause: the device’s web server fails to properly validate the content of incoming HTTP(S) requests before processing them (CWE-755: Improper Handling of Exceptional Conditions).
  • Trigger condition: an attacker sends a specially crafted HTTP(S) request to a specific endpoint on the affected device’s web management interface.
  • Attack vector: network-based, requires no authentication and no user interaction, and has low attack complexity.
  • Impact: the malformed request causes the device to perform an unintended reboot, resulting in a temporary loss of availability for the switch and any network segments relying on it.

Affected software

  • Hirschmann HiOS Switch Platform, versions:
    • 07.0.0 – 07.1.11
    • 08.0.0 – 08.7.09
    • 09.0.00 – 09.0.12
    • 09.3.00 – 09.3.02
    • 10.0.0 – 10.3.07
    • 10.4.00
    • 10.5.00 (pre-fix builds)

Severity

  • CVSS v4.0 Base Score: 8.7 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: upgrade affected devices to the fixed firmware versions: 07.1.12, 08.7.10, 09.0.13, 09.3.03, 10.3.08, or 10.5.00 (or later), as applicable to the current release track.
  • If a patch cannot be applied immediately: restrict network access to the device’s HTTP(S) management interface to trusted management networks only, disable remote/internet-facing exposure of the web management service, and monitor for unexpected device reboots that may indicate exploitation attempts.

References

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