SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2018-4438

A logic issue existed resulting in memory corruption.

EXPLOIT ✓HIGH 8.8EPSS 5.83%

Does this matter?

A public exploit is published in Exploit-DB (verified) and the impact is high, while EPSS rates exploitation at 5.8%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use.

Description

A logic issue existed resulting in memory corruption. This was addressed with improved state management. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.

CVSS 3.0
8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
5.83% probability · 93th percentile
Public exploits
1 in Exploit-DB · verified · first 13 December 2018
CISA KEV
Not listed
Weakness
CWE-119
Affected
apple/safari · apple/iphone os · apple/tvos · apple/watchos · apple/icloud · apple/itunes
Source
product-security@apple.com
EPSS trend
0%5%10%27 October 2026: 5.83%27 October 202627 October 2026

EPSS 5.8% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-45984source ↗WebKit JIT - Int32/Double Arrays can have Proxy Objects in the Prototype Chainsmultiple · Google Security Researchdos13 December 2018yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.