Vulnerability in Abb Ac800m (System 800xa)
CVE-2025-3756
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Abb Ac800m (System 800xa) — versions 6.0.0x, 6.1.0x, 6.1.1x
- Abb S+ Operations — versions 2.1, 2.2, 2.3
- Abb Symphony Plus Mr (Melody Rack) — versions 3.10
- Abb Symphony Plus Sd Series — versions A_0, A_1, A_2.003
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-3756?
- CVE-2025-3756 is a medium-severity vulnerability in Abb Ac800m (System 800xa), classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-04-13.
- How severe is CVE-2025-3756?
- Medium severity. CVSS v3 base score is 6.5 out of 10.