VulnerabilityModified
CVE-2018-4378
A memory corruption issue was addressed with improved validation.
HIGH 8.8EPSS 1.46%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A memory corruption issue was addressed with improved validation. This issue affected versions prior to iOS 12.1, tvOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.
- 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
- 1.46% probability · 73th percentile
- Public exploits
- None in Exploit-DB
- 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 1.5% since 28 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://support.apple.com/kb/HT209192Vendor Advisory
- https://support.apple.com/kb/HT209194Vendor Advisory
- https://support.apple.com/kb/HT209195Vendor Advisory
- https://support.apple.com/kb/HT209196Vendor Advisory
- https://support.apple.com/kb/HT209197Vendor Advisory
- https://support.apple.com/kb/HT209198Vendor Advisory
- https://support.apple.com/kb/HT209192Vendor Advisory
- https://support.apple.com/kb/HT209194Vendor Advisory
- https://support.apple.com/kb/HT209195Vendor Advisory
- https://support.apple.com/kb/HT209196Vendor Advisory
- https://support.apple.com/kb/HT209197Vendor Advisory
- https://support.apple.com/kb/HT209198Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.