CVE-2026-89025 Hirschmann HiOS Switch Platform DoS via Malformed HTTP Request
Remote unauthenticated attackers can cause a denial of service by sending malformed HTTP requests to the web server, requiring an upgrade to patched firmware versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89025?
CVE-2026-89025 is a high-severity denial of service vulnerability in Belden Hirschmann HiOS Switch Platform, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-755
Which versions are affected by CVE-2026-89025?
How do I fix CVE-2026-89025?
No fix has been published for CVE-2026-89025 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-89025 being exploited?
There is no known exploitation of CVE-2026-89025 in the wild and no public exploit code.
Sources
Also known as GHSA-f972-wg3c-28j6.