About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
For more information about security, see the Apple Product Security page.

macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra
Released January 28, 2020
AnnotationKit
Available for: macOS Catalina 10.15.2
Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution
Description: An out-of-bounds read was addressed with improved input validation.
CVE-2020-3877: an anonymous researcher working with Trend Micro's Zero Day Initiative
apache_mod_php
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: Multiple issues in PHP
Description: Multiple issues were addressed by updating to PHP version 7.3.11.
CVE-2019-11043
Audio
Available for: macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with system privileges
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2020-3857: Zhuo Liang of Qihoo 360 Vulcan Team
autofs
Available for: macOS Catalina 10.15.2
Impact: Searching for and opening a file from an attacker controlled NFS mount may bypass Gatekeeper
Description: This was addressed with additional checks by Gatekeeper on files mounted through a network share.
CVE-2020-3866: Jose Castro Almeida (@HackerOn2Wheels) and René Kroka (@rene_kroka)
CoreBluetooth
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6
Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution
Description: A memory corruption issue was addressed with improved input validation.
CVE-2020-3848: Jianjun Dai of Qihoo 360 Alpha Lab
CVE-2020-3849: Jianjun Dai of Qihoo 360 Alpha Lab
CVE-2020-3850: Jianjun Dai of Qihoo 360 Alpha Lab
CoreBluetooth
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6
Impact: A remote attacker may be able to leak memory
Description: An out-of-bounds read was addressed with improved input validation.
CVE-2020-3847: Jianjun Dai of Qihoo 360 Alpha Lab
Crash Reporter
Available for: macOS Mojave 10.14.6, macOS High Sierra 10.13.6, macOS Catalina 10.15.2
Impact: A malicious application may be able to access restricted files
Description: A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks.
CVE-2020-3835: Csaba Fitzl (@theevilbit)
Image Processing
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: Viewing a maliciously crafted JPEG file may lead to arbitrary code execution
Description: A memory corruption issue was addressed with improved input validation.
CVE-2020-3827: Samuel Groß of Google Project Zero
ImageIO
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: Processing a maliciously crafted image may lead to arbitrary code execution
Description: An out-of-bounds read was addressed with improved input validation.
CVE-2020-3826: Samuel Groß of Google Project Zero
CVE-2020-3870
CVE-2020-3878: Samuel Groß of Google Project Zero
Intel Graphics Driver
Available for: macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with system privileges
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2020-3845: Zhuo Liang of Qihoo 360 Vulcan Team
IOAcceleratorFamily
Available for: macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2020-3837: Brandon Azad of Google Project Zero
IPSec
Available for: macOS Catalina 10.15.2
Impact: Loading a maliciously crafted racoon configuration file may lead to arbitrary code execution
Description: An off by one issue existed in the handling of racoon configuration files. This issue was addressed through improved bounds checking.
CVE-2020-3840: @littlelailo
Kernel
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: An application may be able to read restricted memory
Description: A validation issue was addressed with improved input sanitization.
CVE-2020-3875: Brandon Azad of Google Project Zero
Kernel
Available for: macOS Catalina 10.15.2
Impact: An application may be able to read restricted memory
Description: A memory initialization issue was addressed with improved memory handling.
CVE-2020-3872: Haakon Garseg Mørk of Cognite and Cim Stordal of Cognite
Kernel
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: A malicious application may be able to execute arbitrary code with system privileges
Description: A type confusion issue was addressed with improved memory handling.
CVE-2020-3853: Brandon Azad of Google Project Zero
Kernel
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: A malicious application may be able to determine kernel memory layout
Description: An access issue was addressed with improved memory management.
CVE-2020-3836: Brandon Azad of Google Project Zero
Kernel
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2020-3842: Ned Williamson working with Google Project Zero
CVE-2020-3871: Corellium
libxml2
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6
Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution
Description: A buffer overflow was addressed with improved size validation.
CVE-2020-3846: Ranier Vilela
libxpc
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: Processing a maliciously crafted string may lead to heap corruption
Description: A memory corruption issue was addressed with improved input validation.
CVE-2020-3856: Ian Beer of Google Project Zero
libxpc
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: An application may be able to gain elevated privileges
Description: An out-of-bounds read was addressed with improved bounds checking.
CVE-2020-3829: Ian Beer of Google Project Zero
PackageKit
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: A malicious application may be able to overwrite arbitrary files
Description: A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks.
CVE-2020-3830: Csaba Fitzl (@theevilbit)
Security
Available for: macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with system privileges
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2020-3854: Jakob Rieck (@0xdead10cc) and Maximilian Blochberger of the Security in Distributed Systems Group of University of Hamburg
sudo
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: Certain configurations may allow a local attacker to execute arbitrary code
Description: A buffer overflow issue was addressed with improved memory handling.
CVE-2019-18634: Apple
System
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6
Impact: A malicious application may be able to overwrite arbitrary files
Description: An access issue was addressed with improved access restrictions.
CVE-2020-3855: Csaba Fitzl (@theevilbit)
Wi-Fi
Available for: macOS Catalina 10.15.2
Impact: An application may be able to read restricted memory
Description: A validation issue was addressed with improved input sanitization.
CVE-2020-3839: s0ngsari of Theori and Lee of Seoul National University working with Trend Micro's Zero Day Initiative
Wi-Fi
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: A remote attacker may be able to cause unexpected system termination or corrupt kernel memory
Description: A memory corruption issue was addressed with improved input validation.
CVE-2020-3843: Ian Beer of Google Project Zero
wifivelocityd
Available for: macOS High Sierra 10.13.6, macOS Mojave 10.14.6, macOS Catalina 10.15.2
Impact: An application may be able to execute arbitrary code with system privileges
Description: The issue was addressed with improved permissions logic.
CVE-2020-3838: Dayton Pidhirney (@_watbulb)

Additional recognition
Photos Storage
We would like to acknowledge Salman Husain of UC Berkeley for their assistance.