TI-2025-03308 Aliases CVE-2025-3756 GHSA-h84p-pw6f-c6p6

Denial of Service Vulnerabilities in System 800xA, Symphony® Plus IEC 61850

LOW 30CWE-1284Published 2026-04-13 · Updated 2026-04-13

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00184 8th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ABB	AC800M (System 800xA)	6.0.0x – 6.0.0303.0; 6.1.0x – 6.1.0031.0; 6.1.1x – 6.1.1004.0; 6.1.1x – 6.1.1202.0; 6.2.0x – 6.2.0006.0	—	No fix listed	CNA
ABB	Symphony Plus SD Series	A_0; A_1; A_2.003; A_3.005; A_4.001; B_0.005	—	No fix listed	CNA
ABB	Symphony Plus MR (Melody Rack)	3.10 – 3.52	—	No fix listed	CNA
ABB	S+ Operations	2.1; 2.2; 2.3; 3.3	—	No fix listed	CNA

AC800M (System 800xA) VendorABB Affected 6.0.0x – 6.0.0303.0; 6.1.0x – 6.1.0031.0; 6.1.1x – 6.1.1004.0; 6.1.1x – 6.1.1202.0; 6.2.0x – 6.2.0006.0 Fixed in — No fix listed CNA
Symphony Plus SD Series VendorABB Affected A_0; A_1; A_2.003; A_3.005; A_4.001; B_0.005 Fixed in — No fix listed CNA
Symphony Plus MR (Melody Rack) VendorABB Affected 3.10 – 3.52 Fixed in — No fix listed CNA
S+ Operations VendorABB Affected 2.1; 2.2; 2.3; 3.3 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-3756
2026-10-03 Alias added: GHSA-h84p-pw6f-c6p6

References

Other 1

https://search.abb.com/library/Download.aspx?DocumentID=7PAA020125&LanguageCode=en&DocumentPartId=&Action=Launch

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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences