{"schemaVersion":3,"id":"CVE-2025-3756","aliases":[],"status":"published","duplicateOf":null,"title":"Denial of Service Vulnerabilities in System 800xA, Symphony® Plus IEC 61850","description":"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.\n\n\n\n\nThe 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.\n\n\n\n\n\nThis 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.","dates":{"published":"2026-04-13T17:11:08.412Z","modified":"2026-04-13T18:03:41.437Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00184,"percentile":0.07624,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00184},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00184,"percentile":0.07624}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00184,"percentile":0.07624}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input","description":"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.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/1284.html"}],"affected":[{"vendor":"abb","product":"ac800m (system 800xa)","name":"AC800M (System 800xA)","label":"ac800m (system 800xa)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0.0x, ≤ 6.0.0303.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.1.0x, ≤ 6.1.0031.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.1.1x, ≤ 6.1.1004.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.1.1x, ≤ 6.1.1202.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.2.0x, ≤ 6.2.0006.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 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","eol":null,"hubHref":"/vendor/abb/ac800m_system_800xa"},{"vendor":"abb","product":"s+ operations","name":"S+ Operations","label":"s+ operations","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2.1","noFixRecorded":false,"fixedIn":null},{"text":"2.2","noFixRecorded":false,"fixedIn":null},{"text":"2.3","noFixRecorded":false,"fixedIn":null},{"text":"3.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"2.1 | 2.2 | 2.3 | 3.3","eol":null,"hubHref":"/vendor/abb/s_operations"},{"vendor":"abb","product":"symphony plus mr (melody rack)","name":"Symphony Plus MR (Melody Rack)","label":"symphony plus mr (melody rack)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.10, ≤ 3.52","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.10, ≤ 3.52","eol":null,"hubHref":"/vendor/abb/symphony_plus_mr_melody_rack"},{"vendor":"abb","product":"symphony plus sd series","name":"Symphony Plus SD Series","label":"symphony plus sd series","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"A_0","noFixRecorded":false,"fixedIn":null},{"text":"A_1","noFixRecorded":false,"fixedIn":null},{"text":"A_2.003","noFixRecorded":false,"fixedIn":null},{"text":"A_3.005","noFixRecorded":false,"fixedIn":null},{"text":"A_4.001","noFixRecorded":false,"fixedIn":null},{"text":"B_0.005","noFixRecorded":false,"fixedIn":null}],"versionsText":"A_0 | A_1 | A_2.003 | A_3.005 | A_4.001 | B_0.005","eol":null,"hubHref":"/vendor/abb/symphony_plus_sd_series"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://search.abb.com/library/Download.aspx?DocumentID=7PAA020125&LanguageCode=en&DocumentPartId=&Action=Launch","label":"search.abb.com/library/…","hostname":"search.abb.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-04-13T17:11:08.412Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-13T18:03:41.437Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T20:40:58.132Z","stale":false,"partial":false}}