---
id: CVE-2025-3756
title: >-
  A vulnerability exists in the command handling of the IEC 61850 communication
  stack included in the product revisions listed as affected in this CVE
summary: >-
  A vulnerability exists in the command handling of the IEC 61850 communication
  stack included in the product revisions listed as affected in this CVE. An
  attacker with access to IEC 61850 networks could exploit the vulnera bility by
  using…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1284
published: '2026-04-13'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3756'
references:
  - url: >-
      https://search.abb.com/library/Download.aspx?DocumentID=7PAA020125&LanguageCode=en&DocumentPartId=&Action=Launch
    label: cybersecurity@ch.abb.com
tags:
  - nvd
epss: 0.00184
epssPercentile: 0.07476
ingestedAt: '2026-10-14T17:44:53.610Z'
---

## Overview

A vulnerability exists in the command handling of the IEC 61850 communication stack included in the product revisions listed as affected in this CVE. An attacker with access to IEC 61850 networks could exploit the vulnera bility by using a specially crafted 61850 packet, forcing the communication interfaces of the PM 877, CI850 and CI868 modules into fault mode or causing unavailability of the S+ Operations 61850 connectivity, resulting in a denial-of-service situation. 




The System 800xA IEC61850 Connect is not affected. Note: This vulnerability does not impact on the overall availability and functionality of the S+ Operations node, only the 61850 communication function.

   



This issue affects AC800M (System 800xA): from 6.0.0x through 6.0.0303.0, from 6.1.0x through 6.1.0031.0, from 6.1.1x through 6.1.1004.0, from 6.1.1x through 6.1.1202.0, from 6.2.0x through 6.2.0006.0; Symphony Plus SD Series: A_0, A_1, A_2.003, A_3.005, A_4.001, B_0.005; Symphony Plus MR (Melody Rack): from 3.10 through 3.52; S+ Operations: 2.1, 2.2, 2.3, 3.3.

## Remediation

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