CVE-2020-3919

Kernel code execution via improper memory initialization

Published Apr 1, 2020 · Updated Aug 4, 2024

Improper initialization in Apple IOHIDFamily before iOS 13.4, macOS 10.15.4, tvOS 13.4, and watchOS 6.2 allows local users to execute kernel code. The IOHIDFamily component initializes memory incorrectly; Apple has not published the affected function, data structure, or input path. Exploitation requires a malicious application to run locally and grants kernel privileges, placing the affected device under application-controlled kernel code.

CVSS severity7.8
High
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper initialization in Apple IOHIDFamily before iOS 13.4, macOS 10.15.4, tvOS 13.4, and watchOS 6.2 allows local users to execute kernel code. The IOHIDFamily component initializes memory incorrectly; Apple has not published the affected function, data structure, or input path. Exploitation requires a malicious application to run locally and grants kernel privileges, placing the affected device under application-controlled kernel code.

The record

CVE
CVE-2020-3919
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-665, T1068, T1404
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <iOS 13.4 and iPadOS 13.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <iOS 13.4 and iPadOS 13.4
Apple · tvOSversion=unspecified <tvOS 13.4
Apple · macOSversion=unspecified <macOS Catalina 10.15.4
Apple · watchOSversion=unspecified <watchOS 6.2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-665Improper Initialization
T1068Exploitation for Privilege Escalation
T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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