CVE-2018-4251

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-08 · updated 2026-06-17
Weakness: CWE-732

Description

An issue was discovered in certain Apple products. macOS before 10.13.5 is affected. The issue involves the "Firmware" component. It allows attackers to modify the EFI flash-memory region that a crafted app that has root access.

Affected products

macOS: before 10.13.5 — fixed in 10.13.5

How to fix

Upgrade to a fixed version: macOS 10.13.5. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2019/Mar/45
http://www.securitytracker.com/id/1041027
https://support.apple.com/HT208849
http://seclists.org/fulldisclosure/2019/Mar/45
http://www.securitytracker.com/id/1041027
https://support.apple.com/HT208849

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