---
id: CVE-2025-53476
title: >-
  A denial of service vulnerability exists in the ModbusTCP server functionality
  of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58
summary: >-
  A denial of service vulnerability exists in the ModbusTCP server functionality
  of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. A specially crafted
  series of network connections can lead to the server not processing subsequent
  Mo…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-775
published: '2025-10-07'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:10:00.563'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-53476'
references:
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2025-2223'
    label: talos-cna@cisco.com
  - url: 'https://www.talosintelligence.com/vulnerability_reports/TALOS-2025-2223'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00465
epssPercentile: 0.38232
ingestedAt: '2026-10-08T22:11:53.793Z'
---

## Overview

A denial of service vulnerability exists in the ModbusTCP server functionality of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. A specially crafted series of network connections can lead to the server not processing subsequent Modbus requests. An attacker can open a series of TCP connections to trigger this vulnerability.

## Remediation

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