CVE-2025-3756Denial of Service Vulnerabilities in System 800xA, Symphony® Plus IEC 61850
Updated under an hour ago ()
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It affects ABB AC800M (System 800xA) and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1284
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- ABB
- NVD analysis
- Deferred
- Record last updated
- Apr 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ABB AC800M (System 800xA) abb:ac800m_system_800xa (from the name) | 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 | CNA record |
ABB Symphony Plus SD Series abb:symphony_plus_sd_series (from the name) | A_0; A_1; A_2.003; A_3.005; A_4.001; B_0.005 | CNA record |
ABB Symphony Plus MR (Melody Rack) abb:symphony_plus_mr_melody_rack (from the name) | from 3.10 through 3.52 | CNA record |
ABB S+ Operations abb:s+_operations (from the name) | 2.1; 2.2; 2.3; 3.3 | CNA record |
References
- https://search.abb.com/library/Download.aspx?DocumentID=7PAA020125&LanguageCode=en&DocumentPartId=&Action=Launch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.