CVE-2018-25236Network attack vector

Unauthenticated administrative access via HTTP session inheritance

Published Apr 3, 2026 · Updated Apr 3, 2026

Authentication bypass in Belden Hirschmann HiOS and HiSecOS allows remote attackers to gain administrative access via crafted HTTP requests. The HTTP(S) management module accepts specially formed requests and returns the authentication state and privileges of a previously authenticated user. Any unauthenticated network client that can reach the management service can inherit that user's administrative privileges without credentials.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Belden Hirschmann HiOS and HiSecOS allows remote attackers to gain administrative access via crafted HTTP requests. The HTTP(S) management module accepts specially formed requests and returns the authentication state and privileges of a previously authenticated user. Any unauthenticated network client that can reach the management service can inherit that user's administrative privileges without credentials.

The record

CVE
CVE-2018-25236
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Belden Inc.
Product
Hirschmann HiSecOS EAGLE
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=03.00.02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Belden Inc. · Hirschmann HiSecOS EAGLEversion=0 <=03.00.02
Belden Inc. · Hirschmann HiOSversion=0 <=05.07; version=0 <=06.1.04; version=0 <=06.2.00

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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