CVE-2020-9839 json
A race condition was addressed with improved state handling.
published 2020-06-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30618
- cvss
- 7.0
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.7%
- EPSS 3.7% chance of exploitation in 30 days, percentile 89%
- public exploits
- 1
- Metasploit
Summary
A race condition was addressed with improved state handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5, tvOS 13.4.5, watchOS 6.2.5. An application may be able to gain elevated privileges.
Patch / fix
- Apple iOS iOS 13.5 and iPadOS 13.5
- Apple macOS macOS Catalina 10.15.5
- Apple tvOS tvOS 13.4.5
- Apple watchOS watchOS 6.2.5
Timeline
- First public exploit (Metasploit exploit/osx/local/cfprefsd_race_condition)
- Published
Exploit prediction
3.67% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/osx/local/cfprefsd_race_condition macOS cfprefsd Arbitrary File Write Local Privilege Escalation metasploit exploit, excellent rank, 2020-03-18
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.1 | AV:N/AC:H/Au:N/C:P/I:P/A:P |
Affected products
- Apple iOS
- Apple macOS
- Apple tvOS
- Apple watchOS
Classification
- Weakness
-
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
References
-
support.apple.com
/HT211168
vendor-advisory
-
support.apple.com
/HT211170
vendor-advisory
-
support.apple.com
/HT211171
vendor-advisory
-
support.apple.com
/HT211175
vendor-advisory
Sources
- CVE List CVE-2020-9839
- NVD CVE-2020-9839
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.