CVE-2021-30807
HighExploitedPublic exploitA memory corruption issue was addressed with improved memory handling.
Published Oct 13, 2021 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2021-30807 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 26, 2021. Public exploit code is available.
- EPSS estimates a 29% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.7.1, Iphone OS 14.7.1, macOS 11.5.1.
- 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)
29%
Higher than 98.1% 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-2021-30807 brief as a PDF
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Description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. 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 | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Jul 26, 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
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.7.1 |
| Iphone OSApple | See advisory | 14.7.1 |
| macOSApple | >= unspecified | 11.5.1 |
| WatchosApple | See advisory | 7.6.1 |
Patched Releases
Ipados
14.7.1
Iphone OS
14.7.1
macOS
11.5.1, 11.5, 14.7, 7.6
Watchos
7.6.1
Timeline
Added to Industry KEV feed
Jul 26, 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-787 Out-of-bounds Write
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- 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/HT212622
- advisoryhttps://support.apple.com/en-us/HT212623
FAQ
Common Questions.
A memory corruption issue was addressed with improved memory 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 Jul 26, 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 14.7.1, Iphone OS 14.7.1, macOS 11.5.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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