CVE-2017-2491
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.
Does this matter?
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.
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.
- CVSS 3.0
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 8.04% probability · 95th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 4 May 2017
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- apple/iphone os
- Source
- product-security@apple.com
EPSS 8.0% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://www.securityfocus.com/bid/98316Third Party Advisory, VDB Entry
- http://www.zerodayinitiative.com/advisories/ZDI-17-321Third Party Advisory, VDB Entry
- https://support.apple.com/en-us/HT207617Vendor Advisory
- https://www.exploit-db.com/exploits/41964/
- http://www.securityfocus.com/bid/98316Third Party Advisory, VDB Entry
- http://www.zerodayinitiative.com/advisories/ZDI-17-321Third Party Advisory, VDB Entry
- https://support.apple.com/en-us/HT207617Vendor Advisory
- https://www.exploit-db.com/exploits/41964/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.