{"schemaVersion":3,"id":"CVE-2020-24685","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An unauthenticated specially crafted packet sent by an attacker over the network will cause a denial-of-service (DoS) vulnerability. Vulnerability allows attacker to stop the PLC. After stopping (ERR LED flashing red), physical access to the PLC is required in order to restart the application. This issue affects: ABB AC500 V2 products with onboard Ethernet version 2.8.4 and prior versions.","dates":{"published":"2021-02-09T03:57:16.000Z","modified":"2024-08-04T15:19:09.311Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.6,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.6,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.6,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01608,"percentile":0.75683,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.01608},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01608,"percentile":0.75683}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01608,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01608,"percentile":0.75683}]},"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-789","name":"Memory Allocation with Excessive Size Value","description":"The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/789.html"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"abb","product":"ac500_cpu_firmware","name":"ac500 cpu firmware","label":"ac500_cpu_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 2.8.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.8.5","eol":null,"hubHref":"/vendor/abb/ac500_cpu"},{"vendor":"abb","product":"ac500 v2 products with onboard ethernet","name":"AC500 V2 products with onboard Ethernet","label":"ac500 v2 products with onboard ethernet","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"version 2.8.4 and prior versions","noFixRecorded":false,"fixedIn":null}],"versionsText":"version 2.8.4 and prior versions","eol":null,"hubHref":"/vendor/abb/ac500_v2_products_with_onboard_ethernet"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://search.abb.com/library/Download.aspx?DocumentID=3ADR010667&LanguageCode=en&DocumentPartId=&Action=Launch","label":"search.abb.com/library/…","hostname":"search.abb.com","tags":["X Refsource CONFIRM","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-02-09T03:57:16.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T15:19:09.311Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T11:33:48.312Z","stale":false,"partial":false}}