CVE-2021-30869
HighExploitedPublic exploitA type confusion issue was addressed with improved state handling.
Published Oct 13, 2021 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2021-30869 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 2 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 23, 2021. Public exploit code is available.
- EPSS estimates a 4.1% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.4, Iphone OS 12.5.5, Mac OS X <=10.14.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
4.1%
Higher than 90.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-30869 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Sep 23, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
29 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.4 |
| Iphone OSApple | See advisory | 12.5.5 |
| macOSApple | >= unspecified | 11.2 |
| Mac OS XApple | 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006, 10.14.6-security_update_2019-007, 10.14.6-security_update_2020-001, 10.14.6-security_update_2020-002 | 10.14.6 |
| iOS and iPadOS | >= unspecified | 14.4 |
Patched Releases
Ipados
14.4
Iphone OS
12.5.5
Mac OS X
<=10.14.6
macOS
11.2, 12.5, 2021
iOS and iPadOS
14.4
Timeline
Added to Industry KEV feed
Sep 23, 2021
Publicly disclosed
Oct 13, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Oct 21, 2025
Weakness Type
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- advisoryhttps://habr.com/ru/post/579714/
- advisoryhttps://saaramar.github.io/IOMFB_integer_overflow_poc/
- advisoryhttps://securityaffairs.co/wordpress/123236/mobile-2/apple-zero-day-vulnerability.html?utm_source=rss&utm_medium=rss&utm_campaign=apple-zero-day-vulnerability
- advisoryhttps://sensorstechforum.com/apple-three-zero-days-cve-2021-30869/
FAQ
Common Questions.
A type confusion issue was addressed with improved state handling.
Affected: Ipados (Apple); Iphone OS (Apple); macOS (Apple) versions >= unspecified, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 23, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Ipados 14.4, Iphone OS 12.5.5, Mac OS X <=10.14.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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