{"id":"CVE-2020-9819","kind":"vulnerability","aliases":["CVE-2020-9819"],"related":[],"title":"Apple iOS, iPadOS, and watchOS: Apple iOS, iPadOS, and watchOS Memory Corruption Vulnerability","description":"A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.","summary":"Apple's iOS, iPadOS and watchOS Mail app has a memory corruption bug that can corrupt heap memory when it processes a crafted email. An attacker who sends such a message can likely run code on the device, and CISA lists it as exploited in the wild.","severity":"high","cvss":4.3,"epss":0.02178,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Apple iOS, iPadOS, and watchOS","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apple-mail","exploited","ios","ipados","vendor","watchos"],"not_affected_if":["fully-patched-devices"],"how_to_check":"Settings > General > About on the iPhone or iPad shows the iOS/iPadOS version; compare it with the fixed release in Apple's advisory.","fix":"Update iOS, iPadOS and watchOS to a release that includes Apple's fix; CISA says to apply updates per vendor instructions.","status":"open","published_at":"2020-06-09T17:15:13+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:37:23+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T21:37:23Z","model":"claude-haiku-5-5","output":{"fix":"Update iOS, iPadOS and watchOS to a release that includes Apple's fix; CISA says to apply updates per vendor instructions.\nunknown","reach":"internet","impact":"high","summary":"Apple's iOS, iPadOS and watchOS Mail app has a memory corruption bug that can corrupt heap memory when it processes a crafted email. An attacker who sends such a message can likely run code on the device, and CISA lists it as exploited in the wild.","category":"vendor","who_cares":["ios","ipados","watchos","apple-mail"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code on device via a crafted email","analyst_note":"Find the fixed iOS, iPadOS and watchOS versions in Apple's security advisory for CVE-2020-9819 and confirm the exploit details.","how_to_check":"Settings > General > About on the iPhone or iPad shows the iOS/iPadOS version; compare it with the fixed release in Apple's advisory.\nunknown","needs_analyst":true,"not_affected_if":["fully-patched-devices"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000496,"input_tokens":2865,"output_tokens":419,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2020':15A,18A '-9819':16A,19A '12.4.7':101C '13.5':96C,99C '5.3.7':105C '6.2.5':103C 'address':85C 'and':23A 'app':40B 'appl':1A,6A,26B,33B 'apple':20A 'apple-mail':25B 'attack':58B 'bug':45B 'cisa':72B 'code':67B 'consumpt':82C 'corrupt':12A,44B,48B,116C 'craft':55B,109C 'cve':14A,17A 'devic':70B 'email':56B 'exploit':28B,76B 'fix':93C 'handl':89C 'heap':49B,115C 'improv':87C 'io':2A,7A,29B,35B,95C,100C 'ios':21A 'ipado':3A,8A,30B,36B,98C 'ipados':22A 'issu':83C,91C 'lead':113C 'like':65B 'list':73B 'mail':27B,39B,110C 'malici':108C 'may':112C 'memori':11A,43B,50B,81C,88C 'messag':63B,111C 'process':53B,106C 'run':66B 'send':60B 'vendor':31B 'vulner':13A 'watcho':5A,10A,32B,38B,102C,104C 'watchos':24A 'wild':79B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-06-09T17:15:13+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:R/S:U/C:N/I:N/A:L","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-9819","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-9819","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":"2026-10-25T14:39:41+00:00","note":null},{"source":"epss","external_id":"CVE-2020-9819","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-9819","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-2020-9819","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-9819","severity":null,"published_at":"2020-06-09T17:15:13+00:00","modified_at":"2026-06-17T03:28:37+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"}