CVE-2021-30883
HighExploitedPublic exploitA memory corruption issue was addressed with improved memory handling.
Published Oct 28, 2021 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2021-30883 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 11, 2021. Public exploit code is available.
- EPSS estimates a 15% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.8.1, Iphone OS 14.8.1, macOS 11.6.1.
- 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)
15%
Higher than 96.6% 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-2021-30883 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 15.0.2 and iPadOS 15.0.2, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, macOS Big Sur 11.6.1. 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..
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 23, 2022 | Jun 13, 2022 | Not reported |
| Industry KEV feed | Oct 11, 2021 | Jun 13, 2022 | Not reported |
| CIRCL KEV | May 23, 2022 | Jun 13, 2022 | Not reported |
| ENISA EUVD | May 23, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
8 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.8.1 |
| Iphone OSApple | See advisory | 14.8.1 |
| macOSApple | 12.0, >= unspecified | 11.6.1 |
| TvosApple | See advisory | 15.1 |
| WatchosApple | See advisory | 8.1 |
Patched Releases
Ipados
14.8.1
Iphone OS
14.8.1
macOS
11.6.1, 11.6, 12.0, 15.1, 8.1
Tvos
15.1
Watchos
8.1
iOS and iPadOS
14.8, 15.0
Timeline
Added to Industry KEV feed
Oct 11, 2021
Publicly disclosed
Oct 28, 2021
Added to CISA KEV
May 23, 2022
Added to CIRCL KEV
May 23, 2022
Added to ENISA EUVD
May 23, 2022
Last updated
Oct 21, 2025
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- advisoryhttps://isc.sans.edu/diary/rss/27978
- 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://support.apple.com/en-us/HT212846
FAQ
Common Questions.
A memory corruption issue was addressed with improved memory handling.
Affected: Ipados (Apple); Iphone OS (Apple); macOS (Apple) versions 12.0, >= 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 Oct 11, 2021.
Yes. It was added on May 23, 2022 with a federal remediation due date of Jun 13, 2022.
Public exploit code is available.
Fixed versions are available, including Ipados 14.8.1, Iphone OS 14.8.1, macOS 11.6.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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