CVE-2021-1782
HighExploitedPublic exploitA race condition was addressed with improved locking.
Published Oct 13, 2021 · Updated Oct 21, 2025 · Also known as TR-21-0832
Key Facts
Patch immediately- CVE-2021-1782 is a high-severity vulnerability (CVSS 7.0 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 4 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 26, 2021. Public exploit code is available.
- EPSS estimates a 2.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.4, Iphone OS 14.4, Mac OS X 10.14.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.0
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
2.2%
Higher than 82.4% 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-2021-1782 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate 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 | Jan 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
24 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.4 |
| Iphone OSApple | See advisory | 14.4 |
| macOSApple | >= unspecified | 11.2 |
| Mac OS XApple | 10.14.6, 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-security_update_2020-003 | 10.14.6 |
| TvosApple | See advisory | 14.4 |
Patched Releases
Ipados
14.4
Iphone OS
14.4
Mac OS X
10.14.6
macOS
11.2, 14.4, 7.3
Tvos
14.4
Watchos
7.3
iOS and iPadOS
14.4
Timeline
Added to Industry KEV feed
Jan 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-667 Improper Locking
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/xR_aHfkOkh4/apple-issues-urgent-patch-update-for.html
- advisoryhttps://isc.sans.edu/
- advisoryhttps://isc.sans.edu/diary/rss/27250
- advisoryhttps://saaramar.github.io/IOMFB_integer_overflow_poc/
FAQ
Common Questions.
A race condition was addressed with improved locking.
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 Jan 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 14.4, Iphone OS 14.4, Mac OS X 10.14.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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