{"cve":{"cve_id":"CVE-2020-24557","is_kev":true,"kev_date_added":"2021-11-03","kev_vendor_project":"Trend Micro","kev_product":"Apex One, OfficeScan, and Worry-Free Business Security","kev_vulnerability_name":"Trend Micro Multiple Products Improper Access Control Vulnerability","kev_short_description":"Trend Micro Apex One, OfficeScan, and Worry-Free Business Security on Microsoft Windows contain an improper access control vulnerability that may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function, and attain privilege escalation.","kev_required_action":"Apply updates per vendor instructions.","kev_due_date":"2022-05-03","kev_known_ransomware":false,"kev_notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-24557","kev_cwes":[],"epss_score":0.02639,"epss_percentile":0.8359,"epss_as_of":"2026-06-23","description":"A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.","published_at":"2020-09-01T18:55:27Z","last_modified_at":null,"cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":null,"nvd_references":["https://success.trendmicro.com/solution/000263632","https://www.zerodayinitiative.com/advisories/ZDI-20-1094/","https://success.trendmicro.com/solution/000267260"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-28T23:13:51.490687Z"},"effective_severity":"HIGH","badges":["kev"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"trend-micro","vendor_name":"Trend Micro","product_slug":"trend-micro-apex-one","product_name":"Trend Micro Apex One","version_start":"2009 (on premise), SaaS","version_start_inclusive":true,"version_end":"2009 (on premise), SaaS","version_end_inclusive":true,"cpe23_uri":"cve5:trend-micro:trend-micro-apex-one:2009 (on premise), SaaS:2009 (on premise), SaaS"},{"vendor_slug":"trend-micro","vendor_name":"Trend Micro","product_slug":"trend-micro-worry-free-business-security","product_name":"Trend Micro Worry-Free Business Security","version_start":"10.0 SP1","version_start_inclusive":true,"version_end":"10.0 SP1","version_end_inclusive":true,"cpe23_uri":"cve5:trend-micro:trend-micro-worry-free-business-security:10.0 SP1:10.0 SP1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://success.trendmicro.com/solution/000263632","source_type":"MISC","tags":[]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-1094/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://success.trendmicro.com/solution/000267260","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2020-09-01T18:55:27Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2021-11-03T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-06-24T00:31:28.220836Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:28.220836Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:28.220836Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:28.220836Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:28.220836Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:28.220836Z","label":"CVSS score revised","source":"vulnrichment"}]}