{"id":"CVE-2023-43000","kind":"vulnerability","aliases":["CVE-2023-43000"],"related":[],"title":"A use-after-free issue was addressed with improved memory management","description":"Apple macOS, iOS, iPadOS, and Safari 16.6 contain a use-after-free vulnerability due to the processing of maliciously crafted web content that may lead to memory corruption.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Apple macOS, iOS, iPadOS and Safari 16.6 have a use-after-free bug triggered by processing maliciously crafted web content. An attacker can corrupt memory by getting a victim to load a page, which can lead to code execution.","severity":"high","cvss":8.8,"epss":null,"exploited":true,"exploited_at":"2026-03-05T00:00:00+00:00","products":[{"name":"Apple Multiple Products","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"apple safari","fixed":["16.6"],"affected":"< 16.6","ecosystem":"vendor"},{"name":"apple ipados","fixed":["15.8.7"],"affected":"< 15.8.7","ecosystem":"vendor"},{"name":"apple ipados","fixed":["16.6"],"affected":">= 16.0, < 16.6","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["15.8.7"],"affected":"< 15.8.7","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["16.6"],"affected":">= 16.0, < 16.6","ecosystem":"vendor"},{"name":"apple macos","fixed":["13.5"],"affected":"< 13.5","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apple-devices","exploited","ios","ipados","macos","runtime","safari"],"not_affected_if":["fully-patched-devices"],"how_to_check":"Check the installed OS and Safari versions (macOS: Apple menu > About This Mac; iOS/iPadOS: Settings > General > About). Versions older than the fixed release are exposed.","fix":"Update macOS, iOS, iPadOS and Safari to the fixed versions Apple published for CVE-2023-43000; the sources do not name the exact build numbers. If updates cannot be applied, follow the CISA/vendor mitigation guidance.","status":"open","published_at":"2025-11-05T19:15:47+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:39:12+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-23T20:39:12Z","model":"claude-haiku-5-5","output":{"fix":"Update macOS, iOS, iPadOS and Safari to the fixed versions Apple published for CVE-2023-43000; the sources do not name the exact build numbers. If updates cannot be applied, follow the CISA/vendor mitigation guidance.","reach":"internet","summary":"Apple macOS, iOS, iPadOS and Safari 16.6 have a use-after-free bug triggered by processing maliciously crafted web content. An attacker can corrupt memory by getting a victim to load a page, which can lead to code execution.","category":"runtime","who_cares":["macos","ios","ipados","safari","apple-devices"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker runs code and corrupts memory after a victim visits a malicious web page.","analyst_note":"Find Apple's security advisory for CVE-2023-43000 to confirm the exact fixed OS and Safari versions (see the CISA KEV entry and Apple security releases).","how_to_check":"Check the installed OS and Safari versions (macOS: Apple menu > About This Mac; iOS/iPadOS: Settings > General > About). Versions older than the fixed release are exposed.","needs_analyst":true,"not_affected_if":["fully-patched-devices"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.00049,"input_tokens":2543,"output_tokens":471,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':126C '-2023':14A,17A '-43000':15A,18A '16.6':51B,91C '22':125C 'action':116C 'address':8A 'appl':37B,45B,85C 'apple':19A,22A,24A,26A,28A,31A,34A 'apple-devic':36B 'appli':117C 'applic':123C 'attack':67B 'bod':124C 'bug':58B 'cisa':114C 'cloud':129C 'code':83B 'contain':92C 'content':65B,107C 'corrupt':69B,113C 'craft':63B,105C 'cve':13A,16A 'devic':38B 'discontinu':132C 'due':99C 'execut':84B 'exploit':39B 'follow':122C 'free':5A,57B,97C 'get':72B 'guidanc':127C 'improv':10A 'instruct':121C 'io':40B,47B,87C 'ipado':41B,48B,88C 'ipados':25A,27A 'iphone':29A,32A 'issu':6A 'lead':81B,110C 'load':76B 'maco':42B,46B,86C 'macos':35A 'malici':62B,104C 'manag':12A 'may':109C 'memori':11A,70B,112C 'mitig':118C,138C 'multiple':20A 'os':30A,33A 'page':78B 'per':119C 'process':61B,102C 'product':136C 'products':21A 'requir':115C 'runtim':43B 'safari':23A,44B,50B,90C 'servic':130C 'trigger':59B 'unavail':140C 'use':3A,55B,95C,133C 'use-after-fre':2A,54B,94C 'vendor':120C 'victim':74B 'vulner':98C 'web':64B,106C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-11-05T19:15:47+00:00","kev":{"dateAdded":"2026-03-05","dueDate":"2026-03-26","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/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-2023-43000","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43000","severity":null,"published_at":"2026-03-05T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T17:39:55+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-43000","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43000","severity":null,"published_at":"2025-11-05T19:15:47+00:00","modified_at":"2026-09-21T18:17:03+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}