{"id":"CVE-2020-17530","kind":"vulnerability","aliases":["CVE-2020-17530"],"related":[],"title":"Apache Struts: Apache Struts Remote Code Execution Vulnerability","description":"Forced Object-Graph Navigation Language (OGNL) evaluation in Apache Struts, when evaluated on raw user input in tag attributes, can lead to remote code execution.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Apache Struts evaluates raw user input as OGNL expressions inside tag attributes, so attacker-supplied input can execute code. CISA lists this CVE as actively exploited in the wild.","severity":"critical","cvss":9.8,"epss":0.95931,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Apache Struts","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apache-struts","exploited","java","package"],"not_affected_if":["default-config","not-using-struts"],"how_to_check":null,"fix":"Apply the Apache Struts update per vendor instructions; the fixed version is unknown from the sources.","status":"open","published_at":"2020-12-11T02:15:10+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:37:17+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:37:17Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Apache Struts update per vendor instructions; the fixed version is unknown from the sources.","reach":"internet","impact":"high","summary":"Apache Struts evaluates raw user input as OGNL expressions inside tag attributes, so attacker-supplied input can execute code. CISA lists this CVE as actively exploited in the wild.","category":"package","who_cares":["apache-struts","java"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs arbitrary code on the server via crafted input","analyst_note":"Find affected Struts version ranges and fixed release, and the tag-attribute conditions that expose it, at the Apache Struts security bulletin for CVE-2020-17530.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-using-struts","default-config"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.00045,"input_tokens":2832,"output_tokens":334,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find affected Struts version ranges and fixed release, and the tag-attribute conditions that expose it, at the Apache Struts security bulletin for CVE-2020-17530.","search":"'-17530':11A,14A '-2020':10A,13A 'action':81C 'activ':48B 'apach':1A,3A,18B,23B,62C 'apache':15A 'apache-strut':17B 'appli':82C 'attack':37B 'attacker-suppli':36B 'attribut':34B,72C 'cisa':43B,79C 'code':6A,42B,77C 'cve':9A,12A,46B 'evalu':25B,60C,65C 'execut':7A,41B,78C 'exploit':20B,49B 'express':31B 'forc':53C 'graph':56C 'input':28B,39B,69C 'insid':32B 'instruct':86C 'java':21B 'languag':58C 'lead':74C 'list':44B 'navig':57C 'object':55C 'object-graph':54C 'ognl':30B,59C 'packag':22B 'per':84C 'raw':26B,67C 'remot':5A,76C 'requir':80C 'strut':2A,4A,19B,24B,63C 'struts':16A 'suppli':38B 'tag':33B,71C 'updat':83C 'user':27B,68C 'vendor':85C 'vulner':8A 'wild':52B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-12-11T02:15:10+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-2020-17530","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-17530","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":"2026-10-25T10:39:08+00:00","note":null},{"source":"epss","external_id":"CVE-2020-17530","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-17530","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-2020-17530","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17530","severity":null,"published_at":"2020-12-11T02:15:10+00:00","modified_at":"2026-06-17T02:59:05+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"}