CVE-2018-4266

What it is

A race condition was addressed with additional validation. This issue affected versions prior toiVersions prior to: OS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-04-03 18:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:58 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-04-03 18:29 UTC

Last modified

2026-06-17 01:58 UTC

Exploit probability

1.8% · EPSS, next 30 days

Weakness

CWE-362 · Race condition

Record status

Modified

Affected

• Apple Safari < 11.1.2
• Apple Iphone Os < 11.4.1
• Apple Tvos < 11.4.1
• Apple Watchos < 4.3.2
• Apple Icloud < 7.6
• Apple Itunes < 12.8

Attack profile CVSS 3.0 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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