CVE-2020-27950
Apple Multiple Products Memory Initialization Vulnerability
- Medium 5.5
- Exploited: added to CISA KEV 3 Nov 2021
Description
A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.
Key facts
- Published
- 8 Dec 2020
- Last changed
- 21 Oct 2025
- Assigned by
- apple
- KEV added
- 3 Nov 2021
- KEV fix due
- 3 May 2022
- EPSS
- 16.52% likely to be exploited in the next 30 days, higher than 97.047% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: partial
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 5.5CVSS 3.1, Mediumfrom CISA (ADP container)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apple | watchOS |
|
| Apple | iOS and iPadOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
Timeline
- 8 Dec 2020 Published
- 3 Nov 2021 CVE-2020-27950 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue