{"id":"CVE-2021-30983","kind":"vulnerability","aliases":["CVE-2021-30983"],"related":[],"title":"A buffer overflow issue was addressed with improved memory handling","description":"Apple iOS and iPadOS contain a buffer overflow vulnerability that could allow an application to execute code with kernel privileges.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Apple iOS and iPadOS contain a buffer overflow that lets an app run code with kernel privileges. An attacker who runs a malicious app on the device gets full control of the operating system.","severity":"critical","cvss":9.3,"epss":0.02923,"exploited":true,"exploited_at":"2022-06-27T00:00:00+00:00","products":[{"name":"Apple iOS and iPadOS","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"apple ipados","fixed":["15.2"],"affected":"< 15.2","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["15.2"],"affected":"< 15.2","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apple-devices","exploited","infrastructure","ios","ipados"],"not_affected_if":["unpatched-version-not-running"],"how_to_check":"Settings > General > About on the device, and compare the iOS or iPadOS version against Apple's security notes for this CVE.","fix":"Update iOS and iPadOS to the fixed release listed in Apple's security notes for CVE-2021-30983.\nCISA required action: apply updates per vendor instructions.","status":"open","published_at":"2021-08-24T19:15:23+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:12:26+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:12:26Z","model":"claude-haiku-5-5","output":{"fix":"Update iOS and iPadOS to the fixed release listed in Apple's security notes for CVE-2021-30983.\nCISA required action: apply updates per vendor instructions.","reach":"local","impact":"high","summary":"Apple iOS and iPadOS contain a buffer overflow that lets an app run code with kernel privileges. An attacker who runs a malicious app on the device gets full control of the operating system.","category":"infrastructure","who_cares":["ios","ipados","apple-devices"],"confidence":0.6,"needs_auth":"yes","worst_case":"Malicious app gains kernel privileges and full device control","analyst_note":"Fixed version numbers are not in the sources; check Apple's security releases page for the iOS/iPadOS build that fixed CVE-2021-30983 and the affected version range.","how_to_check":"Settings > General > About on the device, and compare the iOS or iPadOS version against Apple's security notes for this CVE.\nunknown","needs_analyst":true,"not_affected_if":["unpatched-version-not-running"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000482,"input_tokens":2834,"output_tokens":398,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2021':12A,15A '-30983':13A,16A 'action':89C 'address':6A 'allow':78C 'and':19A 'app':44B,56B 'appl':27B,33B,67C 'apple':17A,21A,23A 'apple-devic':26B 'appli':90C 'applic':80C 'attack':51B 'buffer':2A,39B,73C 'cisa':87C 'code':46B,83C 'contain':37B,71C 'control':62B 'could':77C 'cve':11A,14A 'devic':28B,59B 'execut':82C 'exploit':29B 'full':61B 'get':60B 'handl':10A 'improv':8A 'infrastructur':30B 'instruct':94C 'io':31B,34B,68C 'ios':18A 'ipado':32B,36B,70C 'ipados':20A,22A 'iphone':24A 'issu':4A 'kernel':48B,85C 'let':42B 'malici':55B 'memori':9A 'oper':65B 'os':25A 'overflow':3A,40B,74C 'per':92C 'privileg':49B,86C 'requir':88C 'run':45B,53B 'system':66B 'updat':91C 'vendor':93C 'vulner':75C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-08-24T19:15:23+00:00","kev":{"dateAdded":"2022-06-27","dueDate":"2022-07-18","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-30983","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-30983","severity":null,"published_at":"2022-06-27T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T10:39:06+00:00","note":null},{"source":"epss","external_id":"CVE-2021-30983","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-30983","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-30983","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30983","severity":null,"published_at":"2021-08-24T19:15:23+00:00","modified_at":"2026-06-17T03:51:15+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+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"}