CVE-2021-30869

HIGH

7.8

CVSS Score

Published: August 24, 2021 at 06:49 PM UTC

Updated: June 17, 2026 at 03:51 AM UTC

3 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity

HIGH7.8

Exploitation

CISA KEV

Exploit prediction

EPSS 4%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score4.1%

EPSS (Exploit Prediction Scoring System) estimates a 4.1% chance this CVE is exploited in the wild within the next 30 days — higher than 91% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Nov 3, 2021

Remediation Due

Nov 17, 2021

1807 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-30869

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS · Apple

95%

v < 14.4

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

iPhone OS · Apple

95%

12.0 ≤ v < 12.5.514.0 ≤ v < 14.4

Affected range stops below 12.5.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement

macOS · Apple

95%

Affected range stops below 11.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 12.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 2021, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212146

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212147

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212824

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.apple.com/en-us/HT212825

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30869

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-843

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