ABB AC800M IEC 61850 Communication Stack improper validation of specified quantity in input

Summaryinfo

A vulnerability identified as critical has been detected in ABB AC800M, Symphony Plus SD, Symphony Plus MR and S+ Operations. This affects an unknown part of the component IEC 61850 Communication Stack. This manipulation causes improper validation of specified quantity in input. This vulnerability is registered as CVE-2025-3756. The attack requires access to the local network. No exploit is available.

Detailsinfo

A vulnerability has been found in ABB AC800M, Symphony Plus SD, Symphony Plus MR and S+ Operations (affected version not known) and classified as critical. Affected by this vulnerability is some unknown functionality of the component IEC 61850 Communication Stack. The manipulation with an unknown input leads to a improper validation of specified quantity in input vulnerability. The CWE definition for the vulnerability is CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at search.abb.com. This vulnerability is known as CVE-2025-3756 since 04/17/2025. The exploitation appears to be easy. The attack can only be initiated within the local network. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• ABB

Name

• AC800M
• S+ Operations
• Symphony Plus MR
• Symphony Plus SD

License

• commercial

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