{"id":"CVE-2021-22900","kind":"vulnerability","aliases":["CVE-2021-22900"],"related":[],"title":"Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Unrestricted File Upload Vulnerability","description":"Ivanti Pulse Connect Secure contains an unrestricted file upload vulnerability that allows an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Ivanti Pulse Connect Secure has an unrestricted file upload flaw: a crafted archive uploaded through the administrator web interface lets the uploader write arbitrary files. CISA lists it as actively exploited.","severity":"high","cvss":7.2,"epss":0.14146,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Ivanti Pulse Connect Secure","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","ivanti","pulse-connect-secure","vendor","vpn"],"not_affected_if":["not-running-pulse-connect-secure"],"how_to_check":null,"fix":"Apply the vendor's updates per Ivanti instructions (CISA required action); the fixed version is unknown from the sources.","status":"open","published_at":"2021-05-27T12:15:07+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:41:53+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T21:41:53Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor's updates per Ivanti instructions (CISA required action); the fixed version is unknown from the sources.","reach":"internet","impact":"high","summary":"Ivanti Pulse Connect Secure has an unrestricted file upload flaw: a crafted archive uploaded through the administrator web interface lets the uploader write arbitrary files. CISA lists it as actively exploited.","category":"vendor","who_cares":["ivanti","pulse-connect-secure","vpn"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with admin access writes arbitrary files onto the appliance","analyst_note":"Confirm affected and fixed versions and the vendor advisory from the CISA KEV entry and Ivanti security advisories, plus a version check procedure.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-running-pulse-connect-secure"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000468,"input_tokens":2871,"output_tokens":362,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Confirm affected and fixed versions and the vendor advisory from the CISA KEV entry and Ivanti security advisories, plus a version check procedure.","search":"'-2021':14A,17A '-22900':15A,18A 'action':95C 'activ':60B 'administr':47B,76C,90C 'allow':73C 'appli':96C 'arbitrari':54B 'archiv':43B,86C 'authent':75C 'cisa':56B,93C 'connect':3A,7A,21A,27B,33B,64C 'contain':66C 'craft':42B,85C 'cve':13A,16A 'exploit':23B,61B 'file':10A,38B,55B,69C,80C 'flaw':40B 'instruct':100C 'interfac':49B,92C 'ivanti':1A,5A,19A,24B,31B,62C 'let':50B 'list':57B 'malici':84C 'per':98C 'perform':78C 'puls':2A,6A,26B,32B,63C 'pulse':20A 'pulse-connect-secur':25B 'requir':94C 'secur':4A,8A,28B,34B,65C 'secure':22A 'unrestrict':9A,37B,68C 'updat':97C 'upload':11A,39B,44B,52B,70C,87C 'vendor':29B,99C 'via':82C 'vpn':30B 'vulner':12A,71C 'web':48B,91C 'write':53B,81C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-05-27T12:15:07+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:H/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-22900","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22900","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-2021-22900","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22900","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-2021-22900","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22900","severity":null,"published_at":"2021-05-27T12:15:07+00:00","modified_at":"2026-06-17T03:37:59+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T21:57:34+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"}