Security readout for executives and security teams
Plain-English summary
Affected Apple systems could tell users proxy login credentials were handled securely even when an HTTP proxy was involved. The main business risk is credential exposure from user trust in a misleading security warning, especially on legacy Apple endpoints still using authenticated proxies.
Executive priority
Treat this as a legacy endpoint hygiene issue rather than an emergency. Prioritize organizations with old Apple devices, proxy authentication, or unmanaged endpoints. The fix path is patching or retirement, and the provided sources do not support active exploitation claims.
Technical view
CVE-2016-4642 is a proxy authentication warning flaw in iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before 10.11.6 or Security Update 2016-004. Apple addressed it through improved warnings. No CVSS, CWE, or affected CPE detail is provided in the bundle.
Likely exposure
Exposure is most likely on outdated Apple devices that still run the named pre-fix versions and use authenticated HTTP proxy configurations. Fully updated or retired devices are unlikely to remain exposed based on the provided sources.
Exploitation context
The provided sources do not show active exploitation, public weaponization, or KEV listing. Practical abuse would depend on users encountering authenticated HTTP proxy flows and misunderstanding the security of credential handling because of the incorrect warning.
Researcher notes
The bundle gives a concise Apple description but lacks CVSS, CWE, exploit detail, and precise CPE mappings. Analysis should stay limited to the named Apple versions and the warning behavior. Do not infer broader proxy stack compromise from these sources alone.
Mitigation direction
- Upgrade iOS devices to 9.3.3 or later where supported.
- Upgrade tvOS devices to 9.2.2 or later where supported.
- Upgrade OS X El Capitan to 10.11.6 or apply Security Update 2016-004.
- Review Apple guidance for any platform-specific update constraints.
- Retire or isolate unsupported legacy Apple devices using authenticated proxies.
Validation and detection
- Inventory Apple endpoints and record exact OS versions.
- Identify devices below iOS 9.3.3, tvOS 9.2.2, or OS X 10.11.6.
- Check whether authenticated HTTP proxies are configured or required.
- Confirm Security Update 2016-004 on eligible OS X systems.
- Review MDM compliance reports for legacy or unmanaged Apple endpoints.
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-2016-4642 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.