Critical 9.8Published Apr 3, 2026

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

Updated under an hour ago (Oct 26, 2026, 2:50 AM ET)

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It affects Belden Hirschmann HiOS and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for Belden Hirschmann HiOS

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Belden Hirschmann HiOS belden:hirschmann_hios (from the name)	through 05.07; through 06.1.04; through 06.2.00; 06.1.05 not affected; 07.0.00 not affected; 03.1.00 not affected	CNA record
Belden Hirschmann HiSecOS EAGLE belden:hirschmann_hisecos_eagle (from the name)	through 03.00.02; 03.0.03 not affected	CNA record

References

https://assets.belden.com/m/52ecadbb5f1b0e04/original/Security-Bulletin-Web-Server-Authentication-Bypass-HiOS-HiSecOS-Hirschmann-BSECV-2018-05.pdfvendor-advisory
https://www.vulncheck.com/advisories/hirschmann-hios-hisecos-authentication-bypass-via-http-management

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.