CVE-2025-3756: Denial of Service Vulnerabilities in System 800xA, Symphony® Plus IEC 61850
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: A0, A1, A2.003, A3.005, A4.001, B0.005; Symphony Plus MR (Melody Rack): from 3.10 through 3.52; S+ Operations: 2.1, 2.2, 2.3, 3.3.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-3756?
CVE-2025-3756 is classified as a Denial of Service vulnerability in the affected ABB products.
How do I fix CVE-2025-3756?
To mitigate CVE-2025-3756, ensure that your ABB products are updated to the latest version as advised by the vendor.
What products are affected by CVE-2025-3756?
CVE-2025-3756 affects ABB AC800M, Symphony Plus SD Series, Symphony Plus MR, and S+ Operations with specific version limitations.
Can CVE-2025-3756 be exploited remotely?
Yes, an attacker with access to IEC 61850 networks can exploit CVE-2025-3756.
What type of attack is associated with CVE-2025-3756?
CVE-2025-3756 is associated with Denial of Service attacks, which can disrupt the functioning of affected systems.