CVE-2016-4657
Apple iOS Webkit Memory Corruption Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 66.79% probability · 99th percentile
- Public exploits
- 2 in Exploit-DB · verified · first 12 March 2017
- CISA KEV
- Listed 24 May 2022 · due 14 June 2022
- Weakness
- CWE-787
- Affected
- apple/iphone os
- Source
- product-security@apple.com
EPSS 66.8% since 30 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.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2016-4657
Public exploits (2)
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://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken Link, Mailing List, Vendor Advisory
- http://www.securityfocus.com/bid/92653Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036694Broken Link, Third Party Advisory, VDB Entry
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
- https://support.apple.com/HT207107Release Notes, Vendor Advisory
- https://www.exploit-db.com/exploits/44836/Exploit, Third Party Advisory, VDB Entry
- https://www.youtube.com/watch?v=xkdPjbaLngEExploit
- http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.htmlBroken Link, Mailing List, Vendor Advisory
- http://www.securityfocus.com/bid/92653Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036694Broken Link, Third Party Advisory, VDB Entry
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/Broken Link
- https://support.apple.com/HT207107Release Notes, Vendor Advisory
- https://www.exploit-db.com/exploits/44836/Exploit, Third Party Advisory, VDB Entry
- https://www.youtube.com/watch?v=xkdPjbaLngEExploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.