CVE-2016-4657
Exploitation confirmed. First attested on 2022-05-24 by CISA-ADP, CISA KEV, GCVE · kevintel.
- Published2016-08-25
- Fixed in9.3.5
- WeaknessCWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2016-08-2521:59CVE publishedNVD
- 2022-05-24Listed as exploited by GCVEGCVE
- 2022-05-24Exploitation first reportedCISA KEV
- 2022-05-24Added to the CISA KEV catalogCISA KEV
- 2025-01-2917:45SSVC exploitation set to activeCISA-ADP
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-4657?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4657?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.3 | < 9.3.5 | 9.3.5 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Apple iphone os to 9.3.5
- CISA’s required action: Apply updates per vendor instructions.due 2022-06-14
Advisories and patches
- lists.apple.comVendor Advisory
- support.apple.comRelease Notes · Vendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 3 repositories, unverifiedMimoja/CVE-2016-4657-NintendoSwitchiDaN5x/Switcherooviai957/webkit-vulnerability PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2022-05-24
- Patch Due Date
- 2022-06-14
- Ransomware Use
- Unknown
- Required Action
- Apply updates per vendor instructions.
Sources
- CISA KEVKEV entry2022-05-24
- GCVEexploitation2022-05-24
- CISA-ADPSSVC decisionactive2025-01-29
- OpenCVESSVC decisionactive—
- CISA-ADPCVSS 3.18.82025-01-29
- NVDCVSS 3.18.8read 2026-10-23
- NVDCVSS 2.06.8read 2026-10-23
- CISA-ADPweakness (CWE)CWE-7872025-01-29
- NVDweakness (CWE)CWE-787read 2026-10-23
- FIRST EPSSEPSS score66.8 %read 2026-10-23
- PoC-in-GitHubproof of concept3read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Published
- 2016-08-25
- Last Modified
- 2026-06-17
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2016-4657?
Is CVE-2016-4657 actively exploited?
What is the CVSS score for CVE-2016-4657?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.