Security readout for executives and security teams
CVE-2016-4657 is an Apple iOS WebKit memory corruption flaw fixed in iOS 9.3.5. A victim only needed to visit a crafted website for possible code execution or device crash. It is listed in CISA KEV, so treat remaining legacy iOS exposure as urgent. Exposure is limited to Apple iOS devices older than 9.3.5 according to the provided CVE description. The bundle does not name other affected Apple platforms or third-party products, so do not expand scope beyond iOS without vendor confirmation. Immediate for any legacy iOS estate. The vulnerable versions are old, but KEV status and Pegasus context make any remaining exposure unacceptable for executives, legal, journalists, administrators, and high-risk personnel. Mitigation focus: Upgrade affected iOS devices to iOS 9.3.5 or later where supported.; Remove or isolate devices that cannot receive the Apple fix.; Prioritize legacy iPhone and iPad inventory checks..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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Open ATT&CK lookupExecution behavior lookup
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Open ATT&CK lookupCVE-2016-4657 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/CVE reference · x_refsource_MISC
- https://www.youtube.com/watch?v=xkdPjbaLngECVE reference · x_refsource_MISC
- 44836CVE reference · exploit, x_refsource_EXPLOIT-DB
- https://support.apple.com/HT207107CVE reference · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4657CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.