Apple · iOS
CVE-2016-4657
Apple iOS Webkit Memory Corruption Vulnerability
What it is
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.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: June 14, 2022
- Added to the CISA list
- May 24, 2022
- Published
- August 25, 2016
- Severity
- High 8.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 67% in the top 0.7% of all known vulnerabilities
- Weakness
- CWE-119
- More details
- NVD · CVE.org · CISA
All references (7)
- http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
- https://www.youtube.com/watch?v=xkdPjbaLngE
- https://www.exploit-db.com/exploits/44836/
- http://www.securityfocus.com/bid/92653
- https://support.apple.com/HT207107
- http://www.securitytracker.com/id/1036694
More exploited flaws from Apple
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Dec 14, 2022 | Type Confusion | iOS | High 8.8 | 8.5% |
| May 24, 2022 | Information Disclosure | iOS | Medium 5.5 | 33% |
| May 24, 2022 | Memory Corruption | iOS | High 7.8 | 24% |
| May 23, 2022 | Memory Corruption | iOS | High 7.8 | 4.6% |
| Nov 3, 2021 | WebKit Buffer Overflow | iOS | High 8.8 | 3.0% |
| Nov 3, 2021 | WebKit Memory Corruption | iOS | High 8.8 | 11% |
| Nov 3, 2021 | WebKit Use-After-Free | iOS | High 8.8 | 11% |
| Sep 29, 2026 | Out-of-Bounds Write | Multiple Products | High 8.8 | 26% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.