Security readout for executives and security teams
CVE-2018-4174 is an Apple Mail issue affecting iOS before 11.3 and macOS before 10.13.4. A network man-in-the-middle could read S/MIME encrypted email because the interface handled message security inconsistently. This matters most where executives, legal, finance, or regulated teams relied on Apple Mail for encrypted email confidentiality. Exposure is most likely on legacy Apple endpoints running iOS earlier than 11.3 or macOS earlier than 10.13.4, especially where Apple Mail handled S/MIME messages. Modern updated systems are unlikely to remain exposed based on the cited fixed versions. Treat this as a targeted confidentiality risk, not a broad emergency. Prioritize remediation for high-sensitivity users and any remaining legacy Apple devices. The business urgency rises if S/MIME was used to protect legal, executive, customer, or regulated communications. Mitigation focus: Upgrade affected iOS devices to 11.3 or later.; Upgrade affected macOS systems to 10.13.4 or later.; Review Apple advisories HT208692 and HT208693 for vendor-specific guidance..
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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ATT&CK lookup starting points
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CVE-2018-4174 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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/HT208692CVE reference · x_refsource_CONFIRM
- https://support.apple.com/HT208693CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
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