CVE-2018-25236

Critical

Description

Hirschmann HiOS and HiSecOS products RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED, EAGLE contain an authentication bypass vulnerability in the HTTP(S) management module that allows unauthenticated remote attackers to gain administrative access by crafting specially formed HTTP requests. Attackers can exploit improper authentication handling to obtain the authentication status and privileges of a previously authenticated user without providing valid credentials.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Hirschmann HiOS

PublishedApr 3, 2026

First seenApr 3, 2026

Weakness typeCWE-287Improper authentication

How to fix

Vendor advisories

assets.belden.com/m/52ecadbb5f1b0e04/original/Security-Bulletin-Web-Server-Authentication-Bypass-HiOS-HiSecOS-Hirschmann-BSECV-2018-05.pdf

Affected products

Product	Affected versions	Fixed in
Belden Hirschmann HiOS	v ≤ 05.07, v ≤ 06.1.04, v ≤ 06.2.00	—
Belden Hirschmann HiSecOS EAGLE	v ≤ 03.00.02	—

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