{"id":"CVE-2020-17519","kind":"vulnerability","aliases":["CVE-2020-17519"],"related":[],"title":"A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any…","description":"A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit b561010b0ee741543c3953306037f00d7a9f0801 from apache/flink:master.","summary":"Apache Flink's JobManager REST interface lets unauthenticated callers read arbitrary files from the JobManager host's local filesystem. An attacker can pull configuration files, credentials, and other sensitive data from the server.","severity":"critical","cvss":9.1,"epss":null,"exploited":true,"exploited_at":"2024-05-23T00:00:00+00:00","products":[{"name":"apache flink","fixed":["1.11.3"],"affected":">= 1.11.0, < 1.11.3","ecosystem":"vendor"},{"name":"Apache Flink","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apache-flink","exploited","java","kubernetes","package","self-hosted"],"not_affected_if":["jobmanager-not-exposed","managed-hosting"],"how_to_check":null,"fix":"Upgrade Apache Flink to a version that includes the fix for CVE-2020-17519 (fixed versions not stated in sources); or follow the vendor mitigation instructions referenced by CISA.","status":"open","published_at":"2021-01-05T12:15:12+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:00:39+00:00","updated_at":"2026-10-24T00:09:51+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:00:39Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade Apache Flink to a version that includes the fix for CVE-2020-17519 (fixed versions not stated in sources); or follow the vendor mitigation instructions referenced by CISA.","reach":"network","impact":"high","summary":"Apache Flink's JobManager REST interface lets unauthenticated callers read arbitrary files from the JobManager host's local filesystem. An attacker can pull configuration files, credentials, and other sensitive data from the server.","category":"package","who_cares":["apache-flink","self-hosted","kubernetes","java"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker reads any file on the JobManager host, including secrets","analyst_note":"Find affected and fixed Flink version ranges and the exact REST endpoint or auth requirement in the Apache Flink security advisory for CVE-2020-17519, and confirm whether the vendor mitigation is a version upgrade or a config change.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting","jobmanager-not-exposed"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000489,"input_tokens":2801,"output_tokens":417,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-17519':22A,25A '-2020':21A,24A '1.11.0':7A,79C '1.11.1':11A,83C '1.11.2':13A,85C '1.11.3':125C '1.12.0':127C 'access':109C,114C 'allow':16A,88C 'apach':5A,31B,40B,77C 'apache':26A,28A 'apache-flink':30B 'apache/flink':143C 'arbitrari':50B 'attack':17A,60B,89C 'b561010b0ee741543c3953306037f00d7a9f0801':141C 'caller':48B 'chang':2A,74C 'commit':140C 'configur':63B 'credenti':65B 'cve':20A,23A 'data':69B 'exploit':33B 'expos':134C 'file':51B,64B,93C,113C 'filesystem':58B,97C 'fix':138C 'flink':6A,27A,29A,32B,41B,78C,124C,130C 'host':39B,55B 'instanc':131C 'interfac':45B,104C 'introduc':3A,75C 'issu':136C 'java':34B 'jobmanag':43B,54B,100C,107C,117C 'kubernet':35B 'let':46B 'local':57B,96C 'master':144C 'packag':36B 'process':108C,118C 'pull':62B 'read':19A,49B,91C 'releas':9A,81C 'rest':44B,103C 'restrict':111C 'self':38B 'self-host':37B 'sensit':68B 'server':72B 'unauthent':47B 'upgrad':122C 'user':120C 'well':15A,87C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-01-05T12:15:12+00:00","kev":{"dateAdded":"2024-05-23","dueDate":"2024-06-13","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-17519","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-17519","severity":null,"published_at":"2024-05-23T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:39+00:00","note":null},{"source":"nvd","external_id":"CVE-2020-17519","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17519","severity":null,"published_at":"2021-01-05T12:15:12+00:00","modified_at":"2026-06-17T02:59:04+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"}