Critical severity · published Apr 3, 2026
CVE-2018-25236
Hirschmann HiOS HiSecOS Authentication Bypass via HTTP Management
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HH
Hirschmann HiOS · Belden
through 05.07; through 06.1.04; through 06.2.00 · source: vendor
HH
Hirschmann HiSecOS EAGLE · Belden
through 03.00.02 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-25236
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-25236
assets.belden.com
https://assets.belden.com/m/52ecadbb5f1b0e04/original/Security-Bulletin-Web-Server-Authentication-Bypass-HiOS-HiSecOS-Hirschmann-BSECV-2018-05.pdf
www.vulncheck.com
https://www.vulncheck.com/advisories/hirschmann-hios-hisecos-authentication-bypass-via-http-management
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