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CVE-2026-89025: Hirschmann HiOS Switch Platform DoS via Malformed HTTP Request

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-24
• Weakness: CWE-755

Description

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.

Affected products

• Belden Hirschmann HiOS Switch Platform: from 07.0.0 through 07.1.11; from 08.0.0 through 08.7.09; from 09.0.00 through 09.0.12; from 09.3.00 through 09.3.02; from 10.0.0 through 10.3.07; 10.4.00, 10.5.00

References

• https://assets.belden.com/asset/2ba884e3-c0c9-40f6-aa22-a9e852b20af4/PSIRT-6_HTTPS_Vulnerability_HiOS.pdf
• https://www.vulncheck.com/advisories/hirschmann-hios-switch-platform-dos-via-malformed-http-request

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