{"id":"CVE-2021-31010","kind":"vulnerability","aliases":["CVE-2021-31010"],"related":[],"title":"A deserialization issue was addressed through improved validation","description":"A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that this issue may have been actively exploited at the time of release..","summary":"A sandbox escape in Apple iOS, macOS and watchOS lets a process confined by the sandbox break out of its restrictions. It is listed as actively exploited in the wild per CISA's KEV catalog.","severity":"high","cvss":7.5,"epss":0.03673,"exploited":true,"exploited_at":"2022-08-25T00:00:00+00:00","products":[{"name":"Apple iOS, macOS, watchOS","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"apple ipados","fixed":["14.8"],"affected":"< 14.8","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["12.5.5"],"affected":">= 12.0, < 12.5.5","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["14.8"],"affected":">= 14.0, < 14.8","ecosystem":"vendor"},{"name":"apple mac os x","fixed":["10.15.7"],"affected":">= 10.15, < 10.15.7","ecosystem":"vendor"},{"name":"apple mac os x","fixed":[],"affected":"= 10.15.7","ecosystem":"vendor"},{"name":"apple macos","fixed":["11.6"],"affected":">= 11.0, < 11.6","ecosystem":"vendor"},{"name":"apple watchos","fixed":["7.6.2"],"affected":"< 7.6.2","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apple-devices","exploited","ios","macos","vendor","watchos"],"not_affected_if":["unknown"],"how_to_check":"Check the installed OS version under Settings > General > About (iOS and watchOS) or Apple menu > About This Mac (macOS) and compare it with Apple's security notes for this CVE. Sources do not give the fixed versions.","fix":"Apply the Apple update that addresses CVE-2021-31010 per vendor instructions, as CISA requires. Fixed version numbers: unknown in the sources.","status":"open","published_at":"2021-08-24T19:15:24+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:10:50+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T21:10:50Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Apple update that addresses CVE-2021-31010 per vendor instructions, as CISA requires. Fixed version numbers: unknown in the sources.","reach":"local","impact":"high","summary":"A sandbox escape in Apple iOS, macOS and watchOS lets a process confined by the sandbox break out of its restrictions. It is listed as actively exploited in the wild per CISA's KEV catalog.","category":"vendor","who_cares":["ios","macos","watchos","apple-devices"],"confidence":0.6,"needs_auth":"yes","worst_case":"Sandboxed code escapes its restrictions and reaches resources outside its sandbox.","analyst_note":"Find Apple's security content page for CVE-2021-31010 to confirm fixed OS versions and the exploitation chain details.","how_to_check":"Check the installed OS version under Settings > General > About (iOS and watchOS) or Apple menu > About This Mac (macOS) and compare it with Apple's security notes for this CVE. Sources do not give the fixed versions.","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"unknown","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000498,"input_tokens":2847,"output_tokens":427,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-005':98C '-2021':10A,13A '-31010':11A,14A '..':142C '11.6':110C '12.5.5':101C '14.8':103C,106C '2021':97C '7.6.2':112C 'abl':118C 'activ':72B,135C 'address':5A,86C 'appl':40B,51B,123C 'apple':15A,19A,21A,24A,27A,31A,35A,37A 'apple-devic':39B 'awar':125C 'big':108C 'break':63B 'catalina':99C 'catalog':81B 'circumv':120C 'cisa':78B 'confin':59B 'cve':9A,12A 'deseri':2A,83C 'devic':41B 'escap':49B 'exploit':42B,73B,136C 'fix':93C 'improv':7A,88C 'io':43B,52B,100C,102C 'ios':16A 'ipado':105C 'ipados':20A 'iphone':22A,25A 'issu':3A,84C,91C,131C 'kev':80B 'let':56B 'list':70B 'mac':28A,32A 'maco':44B,53B,107C 'macos':17A,36A 'may':116C,132C 'os':23A,26A,29A,33A 'per':77B 'process':58B,115C 'releas':141C 'report':128C 'restrict':67B,122C 'sandbox':48B,62B,114C,121C 'secur':95C 'sur':109C 'time':139C 'updat':96C 'valid':8A,89C 'vendor':45B 'watcho':46B,55B,111C 'watchos':18A,38A 'wild':76B 'x':30A,34A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-08-24T19:15:24+00:00","kev":{"dateAdded":"2022-08-25","dueDate":"2022-09-15","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-31010","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-31010","severity":null,"published_at":"2022-08-25T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T12:39:23+00:00","note":null},{"source":"epss","external_id":"CVE-2021-31010","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-31010","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-2021-31010","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31010","severity":null,"published_at":"2021-08-24T19:15:24+00:00","modified_at":"2026-06-17T03:51:18+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"}