{"id":"CVE-2020-8599","kind":"vulnerability","aliases":["CVE-2020-8599"],"related":[],"title":"Trend Micro Apex One and OfficeScan: Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability","description":"Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.","summary":"Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE that lets a remote, unauthenticated attacker write arbitrary data to arbitrary paths and bypass ROOT login. Attackers can take over the security server and the endpoints it manages.","severity":"critical","cvss":10.0,"epss":0.11858,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Trend Micro Apex One and OfficeScan","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apex-one","exploited","officescan","self-hosted","vendor","windows"],"not_affected_if":["managed-hosting","patched-server"],"how_to_check":"Check the installed Apex One or OfficeScan server version against Trend Micro's advisory; the sources do not give a file or setting to inspect.","fix":"Apply the Trend Micro patch or hotfix for Apex One and OfficeScan referenced in the advisory; the sources do not name the fixed version.\nRestrict access to the management console to trusted networks until patched.","status":"open","published_at":"2020-03-18T01:15:12+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T20:29:29+00:00","updated_at":"2026-10-23T20:29:29+00:00","category":"vendor","confidence":0.8,"triage":{"at":"2026-10-23T20:29:29Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Trend Micro patch or hotfix for Apex One and OfficeScan referenced in the advisory; the sources do not name the fixed version.\nRestrict access to the management console to trusted networks until patched.","summary":"Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE that lets a remote, unauthenticated attacker write arbitrary data to arbitrary paths and bypass ROOT login. Attackers can take over the security server and the endpoints it manages.","category":"vendor","who_cares":["apex-one","officescan","windows","self-hosted"],"confidence":0.8,"analyst_note":"Find the fixed build numbers and the hotfix link in Trend Micro's advisory for CVE-2020-8599, and confirm which exposed-to-network configurations are affected; this is in CISA KEV, so verify the fix path.","how_to_check":"Check the installed Apex One or OfficeScan server version against Trend Micro's advisory; the sources do not give a file or setting to inspect.\nunknown","needs_analyst":true,"not_affected_if":["managed-hosting","patched-server"],"severity_if_unknown":"critical"},"cost_usd":0.00042,"input_tokens":2148,"output_tokens":411,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-2020':17A,20A '-8599':18A,21A '2019':42B,83C 'affect':108C 'allow':95C 'and':26A 'apex':3A,9A,24A,29B,40B,81C 'apex-on':28B 'arbitrari':58B,61B,101C,105C 'attack':56B,67B,98C 'authent':13A,114C 'bypass':14A,64B,111C 'contain':47B,88C 'could':94C 'cve':16A,19A 'data':59B,102C 'endpoint':76B 'exe':50B,91C 'exploit':31B,119C 'file':92C 'host':35B 'instal':109C 'let':52B 'login':66B,113C 'manag':78B 'micro':2A,8A,23A,39B,80C 'officescan':6A,12A,27A,32B,44B,85C 'one':4A,10A,25A,30B,41B,82C 'path':62B,106C 'remot':54B,97C 'requir':117C 'root':65B,112C 'secur':72B 'self':34B 'self-host':33B 'server':46B,73B,87C 'take':69B 'trend':1A,7A,22A,38B,79C 'unauthent':55B 'vendor':36B 'vulner':15A,49B,90C,121C 'window':37B 'write':57B,100C 'xg':45B,86C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-03-18T01:15:12+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-8599","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-8599","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T11:39:18+00:00","note":null},{"source":"epss","external_id":"CVE-2020-8599","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-8599","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:43+00:00","fetched_at":"2026-10-23T19:13:43+00:00","note":null},{"source":"nvd","external_id":"CVE-2020-8599","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8599","severity":null,"published_at":"2020-03-18T01:15:12+00:00","modified_at":"2026-06-17T03:26:37+00:00","first_seen_at":"2026-10-23T19:35:23+00:00","fetched_at":"2026-10-23T19:35:23+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}