CVE-2021-30869

KEVApple iOS, iPadOS, and macOS Type Confusion Vulnerability

Description

Apple iOS, iPadOS, and macOS contain a type confusion vulnerability in the XNU which may allow a malicious application to execute code with kernel privileges.

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 12.5.5, iOS 14.4 and iPadOS 14.4, macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, Security Update 2021-006 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges. Apple is aware of reports that an exploit for this issue exists in the wild.

CVSS 3.1 vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

PublishedAug 24, 2021

Last modifiedJun 17, 2026

Added to KEVNov 3, 2021

Remediation dueNov 17, 2021

References

support.apple.com/en-us/HT212146Vendor Advisory
support.apple.com/en-us/HT212147Vendor Advisory
support.apple.com/en-us/HT212824Vendor Advisory
support.apple.com/en-us/HT212825Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30869US Government Resource

0 recent articles mention this CVE

Risk assessment · High

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1804 days
CVSS: 7.8 HIGH
EPSS (30-day exploit probability): 4.1% · top 9% of all CVEs
Weakness: CWE-843

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.