CVE-2018-25236 CRITICAL

CVE-2018-25236: Hirschmann HiOS HiSecOS Authentication Bypass via HTTP Management

Vendor Belden
Product Hirschmann HiOS
Weakness CWE-287 · Improper authentication
Published April 3, 2026
Last update May 14, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
May 14, 2026 Record updated