CVE-2020-3837
HighExploitedPublic exploitA memory corruption issue was addressed with improved memory handling.
Published Feb 27, 2020 · Updated Oct 23, 2025
Key Facts
Patch immediately- CVE-2020-3837 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), Mac OS X (Apple) and 4 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 23, 2022. Public exploit code is available.
- EPSS estimates a 15% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 13.3.1, Iphone OS 13.3.1, Mac OS X 10.15.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
15%
Higher than 96.6% 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-2020-3837 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. An application may be able to execute arbitrary code with kernel privileges.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 27, 2022 | Jul 18, 2022 | Not reported |
| Industry KEV feed | Jun 23, 2022 | Jul 18, 2022 | Not reported |
| CIRCL KEV | Jun 27, 2022 | Jul 18, 2022 | Not reported |
| ENISA EUVD | Jun 27, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
9 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 13.3.1 |
| Iphone OSApple | See advisory | 13.3.1 |
| Mac OS XApple | See advisory | 10.15.3 |
| tvOSApple | >= unspecified | 13.3.1 |
| watchOSApple | >= unspecified | 6.1.2 |
Patched Releases
Ipados
13.3.1
Iphone OS
13.3.1
Mac OS X
10.15.3
tvOS
13.3.1, tvOS 13.3.1
watchOS
6.1.2, watchOS 6.1.2
iOS
iOS 13.3.1 and iPadOS 13.3.1
macOS
macOS Catalina 10.15.3
Timeline
Publicly disclosed
Feb 27, 2020
Added to Industry KEV feed
Jun 23, 2022
Added to CISA KEV
Jun 27, 2022
Added to CIRCL KEV
Jun 27, 2022
Added to ENISA EUVD
Jun 27, 2022
Last updated
Oct 23, 2025
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttps://support.apple.com/HT210918
- advisoryhttps://support.apple.com/HT210919
- advisoryhttps://support.apple.com/HT210920
- advisoryhttps://support.apple.com/HT210921
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A memory corruption issue was addressed with improved memory handling.
Affected: Ipados (Apple); Iphone OS (Apple); Mac OS X (Apple), 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 Jun 23, 2022.
Yes. It was added on Jun 27, 2022 with a federal remediation due date of Jul 18, 2022.
Public exploit code is available.
Fixed versions are available, including Ipados 13.3.1, Iphone OS 13.3.1, Mac OS X 10.15.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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