CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Apple macOS Out-of-Bounds Write Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in tvOS 15.5, watchOS 8.6, macOS Big Sur 11.6.6, macOS Monterey 12.3.1, iOS 15.4.1 and iPadOS 15.4.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited..
Affected products
apple: ipados; apple: iphone os; apple: macos; apple: tvos; apple: watchos
References10
- support.apple.com/en-us/HT213219 Release NotesVendor Advisory
- support.apple.com/en-us/HT213220 Release NotesVendor Advisory
- support.apple.com/en-us/HT213253 Release NotesVendor Advisory
- support.apple.com/en-us/HT213254 Release NotesVendor Advisory
- support.apple.com/en-us/HT213256 Release NotesVendor Advisory
- support.apple.com/en-us/HT213219 Release NotesVendor Advisory
- support.apple.com/en-us/HT213220 Release NotesVendor Advisory
- support.apple.com/en-us/HT213253 Release NotesVendor Advisory
- support.apple.com/en-us/HT213254 Release NotesVendor Advisory
- support.apple.com/en-us/HT213256 Release NotesVendor Advisory
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 12% percentile: 96 · as of 2 November 2026
- CWE
- CWE-787