CVE-2016-4657

Status: AnalyzedHigh (8.8)⚠ Active exploitation💥 Exploit

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

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base score: 8.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 67%
Percentile among all scored CVEs: 99
Score date: 10/10/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Added to catalog: 5/24/2022
Remediation due date: 6/14/2022
Known ransomware use: Unknown

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Metasploit module (reliable, widely available exploit) · WebKit not_number defineProperties UAF
Published on Exploit-DB · WebKit - not_number defineProperties UAF (Metasploit) (6/5/2018)
Published on Exploit-DB · Nintendo Switch - WebKit Code Execution (PoC) (3/12/2017)
Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1203 Exploitation for Client Executionexecution85 %
Primary impactT1059 Command and Scripting Interpreterexecution80 %
Secondary impactT1499.004 Application or System Exploitationimpact60 %

Vector AV:N/UI:R sugiere exploit entregado por web que requiere interacción del usuario (T1203). WebKit RCE permite ejecución de código (T1059); corrupción de memoria puede causar DoS (T1499.004).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic Execution Prevention Behavior Prevention on Endpoint

Affected technologies (1)

Apple — Iphone OS

CWEs

CWE-787
CWE-787

References

Raw JSON (NVD)

Show

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