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PatchSiren cyber security CVE debrief

CVE-2018-25236 Belden CVE debrief

CVE-2018-25236 is an authentication bypass vulnerability in the HTTP(S) management module of Hirschmann HiOS and HiSecOS products, including RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED, and EAGLE. The vulnerability allows unauthenticated remote attackers to gain administrative access by crafting specially formed HTTP requests, exploiting improper authentication handling to obtain the authentication status and privileges of a previously authenticated user without providing valid credentials.

Vendor
Belden
Product
Hirschmann HiOS
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-03
Original CVE updated
2026-07-21
Advisory published
2026-04-03
Advisory updated
2026-07-21

Who should care

Organizations using Hirschmann HiOS and HiSecOS products, specifically RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED, and EAGLE, should prioritize patching this vulnerability to prevent potential unauthorized administrative access.

Technical summary

The CVE-2018-25236 vulnerability is a critical authentication bypass issue in the HTTP(S) management module of multiple Hirschmann products. Attackers can exploit this vulnerability by crafting specially formed HTTP requests, allowing them to gain administrative access without valid credentials. This is achieved by exploiting improper authentication handling, which enables attackers to obtain the authentication status and privileges of a previously authenticated user.

Defensive priority

High priority should be given to patching CVE-2018-25236 due to its critical severity and potential for unauthorized administrative access.

Recommended defensive actions

  • Apply patches or updates provided by the vendor to address the authentication bypass vulnerability.
  • Implement compensating controls, such as restricting access to the HTTP(S) management module.
  • Monitor for suspicious activity and implement exception tracking.
  • Conduct inventory checks to ensure all affected products are identified and remediated.
  • Consider disabling HTTP(S) management module access until patches are applied.

Evidence notes

The CVE record was published on 2026-04-03T23:17:00.823Z and was last modified on 2026-07-21T07:10:00.117Z. The NVD entry is currently Awaiting Analysis. Limited source detail is available, and further verification is required to confirm the scope of affected products and the efficacy of vendor remediation.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-25236 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-25236

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2018-25236 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-25236

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

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

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/hirschmann-hios-hisecos-authentication-bypass-via-http-management

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.