{"id":"CVE-2023-42917","kind":"vulnerability","aliases":["CVE-2023-42917"],"related":[],"title":"A memory corruption vulnerability was addressed with improved locking","description":"Apple iOS, iPadOS, macOS, and Safari WebKit contain a memory corruption vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.\n\nCISA required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","summary":"A memory corruption bug in Apple's WebKit engine, used by iOS, iPadOS, macOS and Safari, lets crafted web content run code. It is listed as actively exploited in the wild.","severity":"critical","cvss":8.8,"epss":null,"exploited":true,"exploited_at":"2023-12-04T00:00:00+00:00","products":[{"name":"Apple Multiple Products","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"apple safari","fixed":["17.1.2"],"affected":"< 17.1.2","ecosystem":"vendor"},{"name":"apple ipados","fixed":["15.8.1"],"affected":"< 15.8.1","ecosystem":"vendor"},{"name":"apple ipados","fixed":["16.7.3"],"affected":">= 16.0, < 16.7.3","ecosystem":"vendor"},{"name":"apple ipados","fixed":["17.1.2"],"affected":">= 17.0, < 17.1.2","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["15.8.1"],"affected":"< 15.8.1","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["16.7.3"],"affected":">= 16.0, < 16.7.3","ecosystem":"vendor"},{"name":"apple iphone os","fixed":["17.1.2"],"affected":">= 17.0, < 17.1.2","ecosystem":"vendor"},{"name":"apple macos","fixed":["14.1.2"],"affected":">= 14.0, < 14.1.2","ecosystem":"vendor"},{"name":"debian linux","fixed":[],"affected":"= 11.0","ecosystem":"vendor"},{"name":"debian linux","fixed":[],"affected":"= 12.0","ecosystem":"vendor"},{"name":"fedoraproject fedora","fixed":[],"affected":"= 38","ecosystem":"vendor"},{"name":"fedoraproject fedora","fixed":[],"affected":"= 39","ecosystem":"vendor"},{"name":"webkitgtk webkitgtk\\+","fixed":["2.42.3"],"affected":"< 2.42.3","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","ios","ipados","macos","safari","vendor","webkit"],"not_affected_if":["fully-patched-devices"],"how_to_check":"Check the device OS version under Settings > General > About (iOS/iPadOS) or Apple menu > About This Mac (macOS) and compare it to the patched release named by Apple.","fix":"Update iOS, iPadOS, macOS and Safari to the patched versions Apple published for this CVE; CISA requires vendor remediation or discontinued use.","status":"open","published_at":"2023-11-30T23:15:07+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:02:44+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"vendor","confidence":0.8,"triage":{"at":"2026-10-23T21:02:44Z","model":"claude-haiku-5-5","output":{"fix":"Update iOS, iPadOS, macOS and Safari to the patched versions Apple published for this CVE; CISA requires vendor remediation or discontinued use.\nunknown","reach":"internet","impact":"high","summary":"A memory corruption bug in Apple's WebKit engine, used by iOS, iPadOS, macOS and Safari, lets crafted web content run code. It is listed as actively exploited in the wild.","category":"vendor","who_cares":["ios","ipados","macos","safari","webkit"],"confidence":0.8,"needs_auth":"no","worst_case":"Attacker runs code on the device after the victim loads malicious web content","analyst_note":"Find Apple's security advisory for CVE-2023-42917 to confirm patched versions for each OS and whether non-Apple WebKit embedders need separate fixes.","how_to_check":"Check the device OS version under Settings > General > About (iOS/iPadOS) or Apple menu > About This Mac (macOS) and compare it to the patched release named by Apple.\nunknown","needs_analyst":true,"not_affected_if":["fully-patched-devices"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"critical"},"cost_usd":0.000501,"input_tokens":2887,"output_tokens":425,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':11A,14A '-42917':12A,15A 'action':139C 'activ':81B 'address':6A 'appl':60B,86C,123C,128C 'apple':16A,19A,21A,23A,25A,27A,30A,33A,36A 'appli':140C 'bug':58B 'cisa':137C 'code':76B,101C 'contain':93C 'content':74B,108C 'corrupt':3A,57B,96C 'could':111C 'craft':72B,106C 'cve':10A,13A 'debian':38A,40A 'discontinu':148C 'engin':63B 'execut':102C 'exploit':48B,82B 'fedora':43A,45A 'fedoraproject':42A,44A 'html':113C,135C 'impact':112C 'improv':8A 'includ':118C 'instruct':146C 'io':49B,66B,87C 'ipado':50B,67B,88C 'ipados':22A,24A,26A 'iphone':28A,31A,34A 'lead':99C 'let':71B 'limit':121C 'linux':39A,41A 'list':79B 'lock':9A 'maco':51B,68B,89C 'macos':37A 'malici':105C 'memori':2A,56B,95C 'mitig':143C,156C 'multiple':17A 'non':127C 'non-appl':126C 'os':29A,32A,35A 'parser':114C 'per':144C 'process':104C,136C 'product':129C,152C 'products':18A 'reli':131C 'remedi':141C,154C 'requir':138C 'run':75B 'safari':20A,52B,70B,91C,124C 'unavail':158C 'use':64B,116C,149C 'vendor':53B,145C 'vulner':4A,97C,110C 'web':73B,107C 'webkit':54B,62B,92C,117C,133C 'webkitgtk':46A,47A 'wild':85B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-11-30T23:15:07+00:00","kev":{"dateAdded":"2023-12-04","dueDate":"2023-12-25","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or 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-2023-42917","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-42917","severity":null,"published_at":"2023-12-04T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T15:39:41+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-42917","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-42917","severity":null,"published_at":"2023-11-30T23:15:07+00:00","modified_at":"2026-06-17T06:24:49+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"}