---
id: CVE-2018-25237
title: >-
  Hirschmann HiSecOS devices versions prior to 05.3.03 contain a buffer overflow
  vulnerability in the HTTPS login interface when RADIUS authentication is
  enabled that allows remote attackers to crash the device or execute arbitrary
  code by…
summary: >-
  Hirschmann HiSecOS devices versions prior to 05.3.03 contain a buffer overflow
  vulnerability in the HTTPS login interface when RADIUS authentication is
  enabled that allows remote attackers to crash the device or execute arbitrary
  code by…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-120
published: '2026-04-03'
updated: '2026-07-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-25237'
references:
  - url: >-
      https://assets.belden.com/m/2d5657b3e5d721c6/original/Security-Bulletin-RADIUS-Authentication-BSECV-2018-04.pdf
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/hirschmann-hisecos-buffer-overflow-via-https-login
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00817
epssPercentile: 0.55166
ingestedAt: '2026-07-21T16:51:40.718Z'
---

## Overview

Hirschmann HiSecOS devices versions prior to 05.3.03 contain a buffer overflow vulnerability in the HTTPS login interface when RADIUS authentication is enabled that allows remote attackers to crash the device or execute arbitrary code by submitting a password longer than 128 characters. Attackers can exploit improper bounds checking in password handling to overflow a fixed-size buffer and achieve denial of service or remote code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.