High 7.8Known exploited (CISA KEV)Published Feb 27, 2020

CVE-2020-3837A memory corruption issue was addressed with improved memory handling.

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects Apple iOS and 6 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jun 27, 2022; federal agencies had to remediate by Jul 18, 2022. Treat that date as your deadline.

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Every CVE for Apple iOS

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Jun 27, 2022; federal remediation due Jul 18, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 14.84% (percentile 97)
Assigned by: apple
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apple iOS apple:ios (from the name)	from unspecified before iOS 13.3.1 and iPadOS 13.3.1	CNA record
Apple macOS apple:macos (from the name)	from unspecified before macOS Catalina 10.15.3	CNA record
Apple tvOS apple:tvos (from the name)	from unspecified before tvOS 13.3.1	CNA record
Apple watchOS apple:watchos (from the name)	from unspecified before watchOS 6.1.2	CNA record
apple ipados apple:ipados	before 13.3.1	NVD
apple iphone_os apple:iphone_os	before 13.3.1	NVD
apple mac_os_x apple:mac_os_x	before 10.15.3	NVD
apple tvos apple:tvos	before 13.3.1	NVD
apple watchos apple:watchos	before 6.1.2	NVD

References

https://support.apple.com/HT210919x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/HT210918x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/HT210921x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/HT210920x-refsource-misc, release-notes, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3837us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.