{"id":"CVE-2016-4657","kind":"vulnerability","aliases":["CVE-2016-4657"],"related":[],"title":"Apple iOS: Apple iOS Webkit Memory Corruption Vulnerability","description":"Apple iOS WebKit contains a memory corruption vulnerability that allows attackers to execute remote code or cause a denial-of-service (DoS) via a crafted web site. 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 updates per vendor instructions.","summary":"Apple iOS WebKit has a memory corruption bug that lets a crafted web page run code or crash the browser. Attackers have used it in the wild, per CISA's known-exploited list.","severity":"high","cvss":8.8,"epss":0.66788,"exploited":true,"exploited_at":"2022-05-24T00:00:00+00:00","products":[{"name":"Apple iOS","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","ios","mobile","safari","vendor","webkit"],"not_affected_if":["ios-already-patched"],"how_to_check":"Check the iOS version on each device under Settings > General > About; compare it to the fixed release listed by Apple's security notes.","fix":"Update iOS to a release that includes Apple's WebKit fix for CVE-2016-4657 (the fixed version is not named in the sources); apply vendor updates per CISA's instruction.","status":"open","published_at":"2016-08-25T21:59:02+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:15:48+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-23T21:15:48Z","model":"claude-haiku-5-5","output":{"fix":"Update iOS to a release that includes Apple's WebKit fix for CVE-2016-4657 (the fixed version is not named in the sources); apply vendor updates per CISA's instruction.\nunknown","reach":"internet","impact":"high","summary":"Apple iOS WebKit has a memory corruption bug that lets a crafted web page run code or crash the browser. Attackers have used it in the wild, per CISA's known-exploited list.","category":"vendor","who_cares":["ios","safari","webkit","mobile"],"confidence":0.7,"needs_auth":"no","worst_case":"Remote code execution in WebKit via a crafted web page, or a browser crash.","analyst_note":"Find the fixed iOS version for CVE-2016-4657 in Apple's security notes (support.apple.com/HT) and confirm the affected version range from the NVD entry.","how_to_check":"Check the iOS version on each device under Settings > General > About; compare it to the fixed release listed by Apple's security notes.\nunknown","needs_analyst":true,"not_affected_if":["ios-already-patched"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000495,"input_tokens":2889,"output_tokens":413,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2016':10A,13A '-4657':11A,14A 'action':115C 'allow':66C 'appl':1A,3A,23B,57C,99C,104C 'apple':15A 'appli':116C 'attack':43B,67C 'browser':42B 'bug':30B 'caus':73C 'cisa':51B,113C 'code':38B,71C 'contain':60C 'corrupt':7A,29B,63C 'could':87C 'craft':34B,82C 'crash':40B 'cve':9A,12A 'denial':76C 'denial-of-servic':75C 'dos':79C 'execut':69C 'exploit':17B,55B 'html':89C,111C 'impact':88C 'includ':94C 'instruct':120C 'io':2A,4A,18B,24B,58C 'ios':16A 'known':54B 'known-exploit':53B 'let':32B 'limit':97C 'list':56B 'memori':6A,28B,62C 'mobil':19B 'non':103C 'non-appl':102C 'page':36B 'parser':90C 'per':50B,118C 'process':112C 'product':105C 'reli':107C 'remot':70C 'requir':114C 'run':37B 'safari':20B,100C 'servic':78C 'site':84C 'updat':117C 'use':45B,92C 'vendor':21B,119C 'via':80C 'vulner':8A,64C,86C 'web':35B,83C 'webkit':5A,22B,25B,59C,93C,109C 'wild':49B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2016-08-25T21:59:02+00:00","kev":{"dateAdded":"2022-05-24","dueDate":"2022-06-14","requiredAction":"Apply updates per vendor instructions.","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-2016-4657","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2016-4657","severity":null,"published_at":"2022-05-24T00:00:00+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-2016-4657","url":"https://api.first.org/data/v1/epss?cve=CVE-2016-4657","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-2016-4657","url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4657","severity":null,"published_at":"2016-08-25T21:59:02+00:00","modified_at":"2026-06-17T00:47:58+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"}