{"id":"CVE-2021-22893","kind":"vulnerability","aliases":["CVE-2021-22893"],"related":[],"title":"Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Use-After-Free Vulnerability","description":"Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild.","summary":"Ivanti Pulse Connect Secure has a use-after-free bug in its license services that lets a remote, unauthenticated attacker run code on the appliance. CISA lists it as actively exploited, and the sources tie it to ransomware campaigns.","severity":"critical","cvss":10.0,"epss":0.47172,"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","ransomware","vendor","vpn"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply the updates per the vendor instructions (sources do not name the fixed version).","status":"open","published_at":"2021-04-23T17:15:08+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:41:42+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-23T21:41:42Z","model":"claude-haiku-5-5","output":{"fix":"Apply the updates per the vendor instructions (sources do not name the fixed version).\nunknown","reach":"internet","impact":"high","summary":"Ivanti Pulse Connect Secure has a use-after-free bug in its license services that lets a remote, unauthenticated attacker run code on the appliance. CISA lists it as actively exploited, and the sources tie it to ransomware campaigns.","category":"vendor","who_cares":["ivanti","pulse-connect-secure","vpn"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated remote attacker runs code on the VPN appliance","analyst_note":"Find the affected and fixed Ivanti Pulse Connect Secure versions and the vendor advisory for CVE-2021-22893, plus indicators of compromise to check, via the KEV entry and Ivanti's security advisory.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000473,"input_tokens":2855,"output_tokens":376,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the affected and fixed Ivanti Pulse Connect Secure versions and the vendor advisory for CVE-2021-22893, plus indicators of compromise to check, via the KEV entry and Ivanti's security advisory.","search":"'-2021':15A,18A '-22893':16A,19A '9.0':76C 'activ':63B 'allow':105C 'applianc':58B 'arbitrari':112C 'attack':53B 'authent':84C 'browser':93C 'bug':43B 'bypass':85C 'campaign':72B 'cisa':59B 'code':55B,113C 'collabor':97C 'connect':3A,7A,22A,28B,35B,74C,101C,118C 'cve':14A,17A 'execut':114C 'exploit':24B,64B,125C 'expos':87C 'featur':98C 'file':91C 'free':12A,42B 'gateway':120C 'higher':79C 'ivanti':1A,5A,20A,25B,33B 'let':49B 'licens':46B 'list':60B 'perform':110C 'puls':2A,6A,27B,34B,73C,95C,100C,117C 'pulse':21A 'pulse-connect-secur':26B 'r3/9.1r1':77C 'ransomwar':30B,71B 'remot':51B,111C 'run':54B 'secur':4A,8A,29B,36B,75C,96C,102C,119C 'secure':23A 'servic':47B 'share':92C 'sourc':67B 'tie':68B 'unauthent':52B,107C 'use':10A,40B 'use-after-fre':9A,39B 'user':108C 'vendor':31B 'vpn':32B 'vulner':13A,81C,86C,122C 'wild':128C 'window':90C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-04-23T17:15:08+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-22893","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22893","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":"2026-10-25T17:39:59+00:00","note":null},{"source":"epss","external_id":"CVE-2021-22893","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22893","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-2021-22893","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22893","severity":null,"published_at":"2021-04-23T17:15:08+00:00","modified_at":"2026-08-12T05:17:37+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"}