{"id":"CVE-2017-2491","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-2491","generatedAt":"2026-10-28T19:03:38.026Z","title":"Use after free vulnerability in the String.replace method JavaScriptCore in Apple Safari in iOS before 10.3 allows remote attackers to execute arbitrary code via a crafted web page, or a crafted file.","description":"Use after free vulnerability in the String.replace method JavaScriptCore in Apple Safari in iOS before 10.3 allows remote attackers to execute arbitrary code via a crafted web page, or a crafted file.","published":"2017-06-27T20:29:01.000Z","lastModified":"2026-06-17T01:16:19.000Z","status":"Modified","sourceIdentifier":"product-security@apple.com","cvss":{"version":"3.0","score":8.8,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["apple/iphone os"],"epss":{"score":0.08038,"percentile":0.94755,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2017-05-04","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":41964,"kind":"exploit","title":"Apple Safari 10.0.3 - 'JSC::CachedCall' Use-After-Free","url":"https://www.exploit-db.com/exploits/41964","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/macos/remote/41964.html","file":"exploits/macos/remote/41964.html","published":"2017-05-04","added":"2017-05-04","updated":"2017-05-05","author":"saelo & niklasb","type":"remote","platform":"macos","port":null,"verified":true,"codes":["CVE-2017-2491"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://phoenhex.re/2017-05-04/pwn2own17-cachedcall-uaf"}]},"verdict":{"level":"urgent","text":"A public exploit is published in Exploit-DB (verified) and the impact is high, while EPSS rates exploitation at 8.0%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/98316","tags":["Third Party Advisory","VDB Entry"],"source":"product-security@apple.com"},{"url":"http://www.zerodayinitiative.com/advisories/ZDI-17-321","tags":["Third Party Advisory","VDB Entry"],"source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT207617","tags":["Vendor Advisory"],"source":"product-security@apple.com"},{"url":"https://www.exploit-db.com/exploits/41964/","source":"product-security@apple.com"},{"url":"http://www.securityfocus.com/bid/98316","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.zerodayinitiative.com/advisories/ZDI-17-321","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT207617","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/41964/","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-2491","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}