{"id":"CVE-2021-22894","kind":"vulnerability","aliases":["CVE-2021-22894"],"related":[],"title":"Ivanti Pulse Connect Secure: Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability","description":"Ivanti Pulse Connect Secure Collaboration Suite contains a buffer overflow vulnerabilities that allows a remote authenticated users to execute code as the root user via maliciously crafted meeting room.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Ivanti Pulse Connect Secure's Collaboration Suite has a buffer overflow in its meeting room handling. An authenticated user can send a crafted meeting room request and run code as root on the appliance.","severity":"critical","cvss":9.0,"epss":0.41284,"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-appliance"],"not_affected_if":["no-pulse-connect-secure"],"how_to_check":"Check the Pulse Connect Secure version against the vendor advisory; the sources do not give a command.","fix":"Apply the Ivanti update for Pulse Connect Secure per the vendor's instructions; the sources do not name a fixed version.\nCISA KEV required action: apply updates per vendor instructions.","status":"open","published_at":"2021-05-27T12:15:07+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:41:40+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-23T21:41:40Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Ivanti update for Pulse Connect Secure per the vendor's instructions; the sources do not name a fixed version.\nCISA KEV required action: apply updates per vendor instructions.","reach":"internet","impact":"high","summary":"Ivanti Pulse Connect Secure's Collaboration Suite has a buffer overflow in its meeting room handling. An authenticated user can send a crafted meeting room request and run code as root on the appliance.","category":"vendor","who_cares":["ivanti","pulse-connect-secure","vpn-appliance"],"confidence":0.7,"needs_auth":"yes","worst_case":"Authenticated user runs code as root on the VPN appliance.","analyst_note":"Get affected and fixed versions and the Ivanti advisory from the vendor page; the KEV entry is confirmed exploited (EPSS 0.413).","how_to_check":"Check the Pulse Connect Secure version against the vendor advisory; the sources do not give a command.\nunknown\nunknown","needs_analyst":true,"not_affected_if":["no-pulse-connect-secure"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000499,"input_tokens":2878,"output_tokens":422,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2021':15A,18A '-22894':16A,19A 'action':99C 'allow':80C 'appli':100C 'applianc':33B,67B 'authent':51B,83C 'buffer':11A,43B,76C 'cisa':97C 'code':62B,87C 'collabor':9A,39B,72C 'connect':3A,7A,22A,28B,36B,70C 'contain':74C 'craft':56B,94C 'cve':14A,17A 'execut':86C 'exploit':24B 'handl':49B 'instruct':104C 'ivanti':1A,5A,20A,25B,34B,68C 'malici':93C 'meet':47B,57B,95C 'overflow':12A,44B,77C 'per':102C 'puls':2A,6A,27B,35B,69C 'pulse':21A 'pulse-connect-secur':26B 'remot':82C 'request':59B 'requir':98C 'room':48B,58B,96C 'root':64B,90C 'run':61B 'secur':4A,8A,29B,37B,71C 'secure':23A 'send':54B 'suit':10A,40B,73C 'updat':101C 'user':52B,84C,91C 'vendor':30B,103C 'via':92C 'vpn':32B 'vpn-applianc':31B 'vulner':13A,78C","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:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-22894","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-22894","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":"2026-10-25T15:39:44+00:00","note":null},{"source":"epss","external_id":"CVE-2021-22894","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22894","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-2021-22894","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22894","severity":null,"published_at":"2021-05-27T12:15:07+00:00","modified_at":"2026-06-17T03:37:58+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"}