CVE-2016-4657
HighExploitedPublic exploitWebKit 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.
Published Aug 25, 2016 · Updated May 20, 2026 · Also known as UBUNTU-CVE-2016-4657
Key Facts
Patch immediately- CVE-2016-4657 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Iphone OS (Apple), qtwebkit-opensource-src (ubuntu), qtwebkit-source (ubuntu) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 15, 2016 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 67% probability of exploitation in the next 30 days.
- Fixed versions are available, including Iphone OS 9.3.5, webkit2gtk 2.14.2-0ubuntu0.16.04.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
67%
Higher than 99.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2016-4657 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 24, 2022 | Jun 14, 2022 | Not reported |
| Industry KEV feed | Aug 15, 2016 | Jun 14, 2022 | Known |
| CIRCL KEV | May 24, 2022 | Jun 14, 2022 | Not reported |
| ENISA EUVD | May 24, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Iphone OSApple | See advisory | 9.3.5 |
| qtwebkit-opensource-srcubuntu | See advisory | n/a |
| qtwebkit-sourceubuntu | See advisory | n/a |
| webkit2gtkubuntu | See advisory | 2.14.2-0ubuntu0.16.04.1 |
| webkitgtkubuntu | See advisory | n/a |
Patched Releases
Iphone OS
9.3.5
webkit2gtk
2.14.2-0ubuntu0.16.04.1
Timeline
Added to Industry KEV feed
Aug 15, 2016
Publicly disclosed
Aug 25, 2016
Added to CISA KEV
May 24, 2022
Added to CIRCL KEV
May 24, 2022
Added to ENISA EUVD
May 24, 2022
Last updated
May 20, 2026
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryAPPLE-SA-2016-08-25-1
- advisoryhttps://support.apple.com/HT207107
- advisoryhttps://ubuntu.com/security/CVE-2016-4613
- advisoryhttps://ubuntu.com/security/CVE-2016-4657
- advisoryhttps://ubuntu.com/security/CVE-2016-4666
FAQ
Common Questions.
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: Iphone OS (Apple); qtwebkit-opensource-src (ubuntu); qtwebkit-source (ubuntu), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 15, 2016 and is known to be used in ransomware campaigns.
Yes. It was added on May 24, 2022 with a federal remediation due date of Jun 14, 2022.
Public exploit code is available.
Fixed versions are available, including Iphone OS 9.3.5, webkit2gtk 2.14.2-0ubuntu0.16.04.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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