CVE-2016-4657

HIGH
8.8
CVSS Score
Published: August 25, 2016 at 09:00 PM UTC
Updated: June 17, 2026 at 12:47 AM UTC
1 product affected across 1 vendoriPhone OS

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Severity
HIGH8.8
Exploitation
CISA KEV
Exploit prediction
EPSS 67%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score66.8%

EPSS (Exploit Prediction Scoring System) estimates a 66.8% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Apple iOS WebKit contains a memory corruption vulnerability that allows attackers to execute remote code or cause a denial-of-service (DoS) via a crafted web site. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
May 24, 2022
Remediation Due
Jun 14, 2022
1596 days overdue

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 9.3.5
Affected range stops below 9.3.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

Vendor Advisoryx_refsource_APPLEBroken LinkMailing List
http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html
VDB Entryx_refsource_BIDBroken LinkThird Party Advisory
http://www.securityfocus.com/bid/92653
VDB Entryx_refsource_SECTRACKBroken LinkThird Party Advisory
http://www.securitytracker.com/id/1036694
x_refsource_CONFIRMRelease NotesVendor Advisory
https://support.apple.com/HT207107
Exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/44836/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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