CVE-2021-1884 json
A race condition was addressed with improved locking.
published 2021-09-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7348
- cvss
- 5.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
Summary
A race condition was addressed with improved locking. This issue is fixed in Security Update 2021-004 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, Security Update 2021-003 Catalina, tvOS 14.5, macOS Big Sur 11.3. A remote attacker may be able to cause a denial of service.
Patch / fix
- Apple iOS and iPadOS 14.5
- Apple tvOS 14.5
- Apple watchOS 7.4
- Apple macOS 11.3, 2021
Exploit prediction
1.62% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- Apple iOS and iPadOS
- Apple tvOS
- Apple watchOS
- Apple macOS
Classification
- Weakness
-
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
References
-
support.apple.com
/en-us/HT212317
vendor-advisory
-
support.apple.com
/en-us/HT212323
vendor-advisory
-
support.apple.com
/en-us/HT212324
vendor-advisory
-
support.apple.com
/en-us/HT212530
vendor-advisory
-
support.apple.com
/en-us/HT212325
vendor-advisory
-
support.apple.com
/en-us/HT212531
vendor-advisory
Sources
- CVE List CVE-2021-1884
- NVD CVE-2021-1884
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.