CVE-2020-9991 json
This issue was addressed with improved checks.
published 2020-12-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30770
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.8%
- EPSS 2.8% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, iOS 14.0 and iPadOS 14.0, iCloud for Windows 7.21, tvOS 14.0. A remote attacker may be able to cause a denial of service.
Patch / fix
- Apple tvOS 14.0
- Apple watchOS 7.0
- Apple iCloud for Windows 7.21
- Apple iOS and iPadOS 14.0
- Apple macOS 11.0
Exploit prediction
2.82% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- Apple tvOS
- Apple watchOS
- Apple iCloud for Windows
- Apple iOS and iPadOS
- Apple macOS
References
-
support.apple.com
/kb/HT211846
vendor-advisory
-
support.apple.com
/en-us/HT211843
vendor-advisory
-
support.apple.com
/en-us/HT211850
vendor-advisory
-
support.apple.com
/en-us/HT211844
vendor-advisory
-
support.apple.com
/en-us/HT211931
vendor-advisory
-
support.apple.com
/en-us/HT211847
vendor-advisory
-
seclists.org
/fulldisclosure/2020/Dec/32
mailing-list, third-party-advisory
-
lists.apache.org
/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
mailing-list
Sources
- CVE List CVE-2020-9991
- NVD CVE-2020-9991
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.