What is CVE-2021-30869?

CVE-2021-30869 is a high-severity vulnerability in Apple iOS And Ipados, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-08-24.

How severe is CVE-2021-30869?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2021-30869 known to be exploited?

Yes. CVE-2021-30869 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Vulnerability in Apple iOS And Ipados

CVE-2021-30869

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.

Published 2021-08-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.041 (90.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple Mac OS X — versions 10.14.6, 10.15.7

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

support.apple.com/en-us/HT212147 (Vendor Advisory)
support.apple.com/en-us/HT212146 (Vendor Advisory)
support.apple.com/en-us/HT212824 (Vendor Advisory)
support.apple.com/en-us/HT212825 (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-30869?: CVE-2021-30869 is a high-severity vulnerability in Apple iOS And Ipados, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.8/10. Published 2021-08-24.
How severe is CVE-2021-30869?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-30869 known to be exploited?: Yes. CVE-2021-30869 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.