{"id":"CVE-2024-55956","kind":"vulnerability","aliases":["CVE-2024-55956"],"related":[],"title":"In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can…","description":"Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Cleo Harmony, VLTrader and LexiCom, managed file transfer products, accept file uploads without authentication. An attacker can drop a file into the Autorun directory and have it executed as bash or PowerShell commands on the host.","severity":"critical","cvss":9.8,"epss":null,"exploited":true,"exploited_at":"2024-12-17T00:00:00+00:00","products":[{"name":"Cleo Multiple Products","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"cleo harmony","fixed":["5.8.0.24"],"affected":"< 5.8.0.24","ecosystem":"vendor"},{"name":"cleo lexicom","fixed":["5.8.0.24"],"affected":"< 5.8.0.24","ecosystem":"vendor"},{"name":"cleo vltrader","fixed":["5.8.0.24"],"affected":"< 5.8.0.24","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["cleo","exploited","harmony","lexicom","managed-file-transfer","ransomware","self-hosted","vendor","vltrader"],"not_affected_if":["product-not-installed"],"how_to_check":"Check whether Cleo Harmony, VLTrader or LexiCom is installed and whether the Autorun directory is exposed to network uploads; the sources do not give a specific command or file path.","fix":"Apply the vendor mitigations per Cleo's advisory, or discontinue use of the product if mitigations are unavailable (CISA required action).","status":"open","published_at":"2024-12-13T21:15:13+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:55:59+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-23T20:55:59Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations per Cleo's advisory, or discontinue use of the product if mitigations are unavailable (CISA required action).","reach":"internet","impact":"high","summary":"Cleo Harmony, VLTrader and LexiCom, managed file transfer products, accept file uploads without authentication. An attacker can drop a file into the Autorun directory and have it executed as bash or PowerShell commands on the host.","category":"vendor","who_cares":["cleo","managed-file-transfer","harmony","vltrader","lexicom","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated attacker runs arbitrary shell or PowerShell commands on the host","analyst_note":"Find Cleo's vendor advisory and the specific mitigation steps and fixed versions; the signal lists affected/fixed as unknown.","how_to_check":"Check whether Cleo Harmony, VLTrader or LexiCom is installed and whether the Autorun directory is exposed to network uploads; the sources do not give a specific command or file path.","needs_analyst":true,"not_affected_if":["product-not-installed"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"critical"},"cost_usd":0.000506,"input_tokens":2875,"output_tokens":437,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':17A,20A '-55956':18A,21A '5.8.0.24':5A,8A,12A 'accept':54B 'action':128C 'allow':100C 'appli':129C 'arbitrari':108C 'attack':60B 'authent':58B 'autorun':67B,124C 'bash':74B,109C 'cisa':126C 'cleo':2A,22A,25A,27A,29A,31B,45B,81C 'command':77B,112C 'contain':92C 'could':99C 'cve':16A,19A 'default':120C 'directori':68B,125C 'discontinu':135C 'drop':62B 'execut':72B,107C 'exploit':32B 'file':37B,51B,55B,64B,89C,95C 'harmoni':3A,33B,46B,82C 'harmony':26A 'host':42B,80B,115C 'import':105C 'instruct':133C 'leverag':118C 'lexicom':10A,28A,34B,49B,85C 'manag':36B,50B,88C 'managed-file-transf':35B 'mitig':130C,141C 'multiple':23A 'per':131C 'powershel':76B,111C 'product':53B,91C,139C 'products':24A 'ransomwar':39B 'requir':127C 'self':41B 'self-host':40B 'set':121C 'system':116C 'transfer':38B,52B,90C 'unauthent':14A,102C 'unavail':143C 'unrestrict':94C 'upload':56B,96C 'use':136C 'user':15A,103C 'vendor':43B,132C 'vltrader':6A,30A,44B,47B,83C 'vulner':97C 'without':57B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-12-13T21:15:13+00:00","kev":{"dateAdded":"2024-12-17","dueDate":"2025-01-07","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"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-2024-55956","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-55956","severity":null,"published_at":"2024-12-17T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:38+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-55956","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-55956","severity":null,"published_at":"2024-12-13T21:15:13+00:00","modified_at":"2026-08-05T05:16:42+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+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"}