{"id":"CVE-2021-27101","kind":"vulnerability","aliases":["CVE-2021-27101"],"related":[],"title":"Accellion FTA: Accellion FTA SQL Injection Vulnerability","description":"Accellion FTA contains a SQL injection vulnerability exploited via a crafted host header in a request to document_root.html.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Accellion FTA, a file transfer appliance, has a SQL injection flaw triggered by a crafted Host header in a request to document_root.html. An unauthenticated attacker can run SQL against the database, and the flaw is known to be exploited in the wild, including in ransomware campaigns.","severity":"critical","cvss":9.8,"epss":0.05998,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Accellion FTA","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["accellion-fta","exploited","file-transfer-appliance","ransomware","vendor"],"not_affected_if":["not-accellion-fta"],"how_to_check":null,"fix":"Apply updates per vendor instructions (CISA required action); the specific fixed version is unknown from the sources.","status":"open","published_at":"2021-02-16T21:15:13+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:43:34+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T21:43:34Z","model":"claude-haiku-5-5","output":{"fix":"Apply updates per vendor instructions (CISA required action); the specific fixed version is unknown from the sources.","reach":"internet","impact":"high","summary":"Accellion FTA, a file transfer appliance, has a SQL injection flaw triggered by a crafted Host header in a request to document_root.html. An unauthenticated attacker can run SQL against the database, and the flaw is known to be exploited in the wild, including in ransomware campaigns.","category":"vendor","who_cares":["accellion-fta","file-transfer-appliance"],"confidence":0.6,"needs_auth":"no","worst_case":"Unauthenticated attacker runs SQL, reads or alters stored data","analyst_note":"Find vendor advisory and fixed FTA versions, plus indicators of compromise and a check for the document_root.html Host header abuse, via the CISA KEV entry for CVE-2021-27101.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-accellion-fta"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000475,"input_tokens":2818,"output_tokens":386,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find vendor advisory and fixed FTA versions, plus indicators of compromise and a check for the document_root.html Host header abuse, via the CISA KEV entry for CVE-2021-27101.","search":"'-2021':9A,12A '-27101':10A,13A 'accellion':1A,3A,14A,17B,26B,72C 'accellion-fta':16B 'action':92C 'appli':93C 'applianc':23B,31B 'attack':50B 'campaign':71B 'cisa':90C 'contain':74C 'craft':40B,82C 'cve':8A,11A 'databas':56B 'document_root.html':47B,89C 'exploit':19B,64B,79C 'file':21B,29B 'file-transfer-appli':20B 'flaw':36B,59B 'fta':2A,4A,15A,18B,27B,73C 'header':42B,84C 'host':41B,83C 'includ':68B 'inject':6A,35B,77C 'instruct':97C 'known':61B 'per':95C 'ransomwar':24B,70B 'request':45B,87C 'requir':91C 'run':52B 'sql':5A,34B,53B,76C 'transfer':22B,30B 'trigger':37B 'unauthent':49B 'updat':94C 'vendor':25B,96C 'via':80C 'vulner':7A,78C 'wild':67B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-02-16T21:15:13+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","requiredAction":"Apply updates per vendor instructions.","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-2021-27101","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-27101","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":"2026-10-25T17:39:58+00:00","note":null},{"source":"epss","external_id":"CVE-2021-27101","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-27101","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-27101","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27101","severity":null,"published_at":"2021-02-16T21:15:13+00:00","modified_at":"2026-06-17T03:44:17+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+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"}