Security readout for executives and security teams
Plain-English summary
CVE-2016-4643 is an Apple platform parsing flaw fixed in 2016. Affected Apple operating systems mishandled validation while parsing 407 responses. The public sources do not state impact, severity, or active exploitation, so urgency depends mainly on whether any legacy Apple devices still run the affected releases.
Executive priority
Low immediate urgency unless legacy Apple devices remain in production. The main business task is confirming those devices are patched, upgraded, or retired because the public record does not establish current exploitation or severity.
Technical view
Apple described this as a validation issue in parsing 407 responses, addressed through improved response validation. The affected scope is iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before 10.11.6 or Security Update 2016-004. No CVSS, CWE, exploit detail, or impact statement is provided in the bundle.
Likely exposure
Exposure is most likely limited to legacy Apple devices or systems still running the listed pre-fix versions. Modern, updated Apple systems are not identified as affected in the supplied sources.
Exploitation context
The source bundle does not report active exploitation, and CISA KEV status is false. The sources also do not provide exploit mechanics or real-world attack observations.
Researcher notes
The public record is sparse: Apple names the vulnerable parsing area and fixed versions but does not provide CVSS, CWE, impact, or exploit status. Avoid assuming affected applications beyond the listed operating systems.
Mitigation direction
- Inventory Apple systems for the affected OS versions.
- Update iOS to 9.3.3 or later where applicable.
- Update tvOS to 9.2.2 or later where applicable.
- Apply OS X El Capitan 10.11.6 or Security Update 2016-004.
- Check Apple guidance for unsupported legacy upgrade paths.
Validation and detection
- Confirm device OS versions through asset management records.
- Verify affected Apple systems received the named fixed releases.
- Check patch compliance for retired or unmanaged Apple endpoints.
- Review exceptions for devices unable to receive updates.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2016-4643 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/HT206902CVE reference · x_refsource_MISC
- https://support.apple.com/HT206903CVE reference · x_refsource_MISC
- https://support.apple.com/HT206905CVE reference · x_refsource_CONFIRM
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.