---
id: CVE-2018-25426
title: >-
  WinMTR 0.91 contains a denial of service vulnerability that allows attackers
  to crash the application by sending a malformed payload file containing a
  large buffer of repeated characters
summary: >-
  WinMTR 0.91 contains a denial of service vulnerability that allows attackers
  to crash the application by sending a malformed payload file containing a
  large buffer of repeated characters. Attackers can create a specially crafted
  input fi…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-120
vendor: winmtr
product: winmtr
affected:
  - winmtr = 0.91
published: '2026-05-30'
updated: '2026-07-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-25426'
references:
  - url: 'http://winmtr.net'
    label: disclosure@vulncheck.com
  - url: 'http://winmtr.net/winmtr_download/'
    label: disclosure@vulncheck.com
  - url: 'https://www.exploit-db.com/exploits/45769'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/winmtr-denial-of-service-via-buffer-overflow
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00514
epssPercentile: 0.42773
ingestedAt: '2026-07-23T06:14:18.149Z'
---

## Overview

WinMTR 0.91 contains a denial of service vulnerability that allows attackers to crash the application by sending a malformed payload file containing a large buffer of repeated characters. Attackers can create a specially crafted input file with 238 bytes of data to trigger a buffer overflow condition that causes the application to crash.

## Affected

- `winmtr = 0.91`

## Remediation

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