Adobe releases updates (APSB21-55) to fix several critical vulnerabilities in Reader and Acrobat

Hello everyone,

In this month's security release, Adobe has fixed several critical, important, and moderate security vulnerabilities in Reader and Acrobat for Windows and macOS. If these vulnerabilities are exploited, they could cause arbitrary code execution in the context of the current user.

The details of the vulnerabilities fixed are as follows:

CVE-ID	Severity	Impact
CVE-2021-39841	Critical	Arbitrary code execution
CVE-2021-39863	Critical	Arbitrary code execution
CVE-2021-39857 CVE-2021-39856 CVE-2021-39855	Moderate	Arbitrary file system read
CVE-2021-39844	Critical	Memory leak
CVE-2021-39861	Important	Memory leak
CVE-2021-39858	Moderate	Arbitrary file system read
CVE-2021-39843	Critical	Memory leak
CVE-2021-39846 CVE-2021-39845	Critical	Arbitrary code execution
CVE-2021-35982	Important	Arbitrary code execution
CVE-2021-39840 CVE-2021-39842 CVE-2021-39839 CVE-2021-39838 CVE-2021-39837 CVE-2021-39836	Critical	Arbitrary code execution
CVE-2021-39860	Important	Memory leak
CVE-2021-39852	Critical	Application denial-of-service
CVE-2021-39854 CVE-2021-39853 CVE-2021-39850 CVE-2021-39849	Important	Application denial-of-service
CVE-2021-39851	Important	Application denial-of-service

The affected versions include:

Acrobat DC Continuous - 2021.005.20060 and earlier versions
Acrobat Reader DC Continuous - 2021.005.20060 and earlier versions
Acrobat 2017 Classic 2017 - 2017.011.30199 and earlier versions
Acrobat Reader 2017 Classic 2017 - 2017.011.30199 and earlier versions
Acrobat 2020 Classic 2020 - 2020.004.30006 and earlier versions
Acrobat Reader 2020 Classic 2020 - 2020.004.30006 and earlier versions

To patch these vulnerabilities, initiate a sync between the Patch Manager Plus server and the Central Patch repository. Search for the following Patch IDs or Bulletin IDs and install them in your target systems.

Patch ID	Bulletin ID	Description
321390	TU-753	Adobe Acrobat 2017 Pro and Standard (Acrobat 2017 Track) update - All languages (17.011.30202) (APSB21-55)
321391	TU-1222	Adobe Acrobat 2020 (Classic Track) (20.004.30015) (APSB21-55)
321392	TU-137	Adobe Acrobat DC Pro and Standard (Continuous Track) update - All languages (21.007.20091) (APSB21-55)
321393	TU-754	Adobe Acrobat Reader 2017 MUI (Classic Track) (17.011.30202) (APSB21-55)
321394	TU-1178	Adobe Acrobat Reader 2020 MUI (Classic Track) (20.004.30015) (APSB21-55)
321395	TU-072	Adobe Acrobat Reader DC (21.007.20091) (APSB21-55)
321396	TU-073	Adobe Acrobat Reader DC MUI (21.007.20091) (APSB21-55)