Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2016-4657 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Apple Iphone Os. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Security Account Manager (T1003.002); ranked in the top 0.7% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
WebKit, the browser rendering engine in Apple iOS versions prior to 9.3.5, contains a memory corruption vulnerability tracked as CVE-2016-4657 and assigned CWE-787. The flaw is reachable remotely and carries a CVSS 3.1 base score of 8.8, reflecting network attack vector, low complexity, no required privileges, and required user interaction, with high impact on confidentiality, integrity, and availability.
An unauthenticated remote attacker can exploit the issue by serving a specially crafted web page that triggers out-of-bounds memory access when rendered in Safari or any WebKit-based application. Successful exploitation permits arbitrary code execution in the context of the mobile Safari process or, alternatively, a denial-of-service crash.
Apple’s security advisory and the corresponding support document HT207107 state that the vulnerability is resolved in iOS 9.3.5; users are advised to install the update promptly. Public references also link the same WebKit flaw to the Trident exploit kit observed in targeted mobile surveillance campaigns.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2016-5643
Vulnerability Data
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.
- CWE(s)
- KEV Date Added
- 24 May 2022
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability scanning and recording can discover out-of-bounds write flaws so they can be remediated.
Patching or replacing vulnerable software directly eliminates known instances of this coding weakness.
Secure-development practices (static analysis, bounds checking, code review) are the primary means of preventing out-of-bounds writes.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.