Adobe Security Bulletin

Security update available for Adobe Acrobat and Reader | APSB21-29

Bulletin ID

Date Published

Priority

APSB21-29

May 11, 2021

1

Summary

Adobe has released security updates for Adobe Acrobat and Reader for Windows and macOS. These updates address multiple critical and  important vulnerabilities. Successful exploitation could lead to arbitrary code execution in the context of the current user.       

Adobe has received a report that CVE-2021-28550 has been exploited in the wild in limited attacks targeting Adobe Reader users on Windows.

Affected Versions

Product

Track

Affected Versions

Platform

Acrobat DC 

Continuous 

2021.001.20150 and earlier versions          

Windows

Acrobat Reader DC

Continuous 

2021.001.20150 and earlier versions          

Windows 

Acrobat DC 

Continuous 

2021.001.20149 and earlier 

versions    

macOS

Acrobat Reader DC

Continuous 

2021.001.20149 and earlier 

versions          

macOS

 

 

 

 

Acrobat 2020

Classic 2020           

2020.001.30020 and earlier versions

Windows & macOS

Acrobat Reader 2020

Classic 2020           

2020.001.30020 and earlier versions

Windows & macOS

 

 

 

 

Acrobat 2017

Classic 2017

2017.011.30194  and earlier versions          

Windows & macOS

Acrobat Reader 2017

Classic 2017

2017.011.30194  and earlier versions          

Windows & macOS

Solution

Adobe recommends users update their software installations to the latest versions by following the instructions below.    

The latest product versions are available to end users via one of the following methods:    

  • Users can update their product installations manually by choosing Help > Check for Updates.     

  • The products will update automatically, without requiring user intervention, when updates are detected.      

  • The full Acrobat Reader installer can be downloaded from the Acrobat Reader Download Center.     

For IT administrators (managed environments):     

  • Refer to the specific release note version for links to installers.     

  • Install updates via your preferred methodology, such as AIP-GPO, bootstrapper, SCUP/SCCM (Windows), or on macOS, Apple Remote Desktop and SSH.     

   

Adobe categorizes these updates with the following priority ratings and recommends users update their installation to the newest version:    

Product

Track

Updated Versions

Platform

Priority Rating

Availability

Acrobat DC

Continuous

2021.001.20155       

Windows and macOS

1

Acrobat Reader DC

Continuous

2021.001.20155  

Windows and macOS

1

Release Notes     

 

 

 

 

 

 

Acrobat 2020

Classic 2020           

2020.001.30025 

Windows and macOS     

1

Acrobat Reader 2020

Classic 2020           

2020.001.30025 

Windows and macOS     

1

 

 

 

 

 

 

Acrobat 2017

Classic 2017

2017.011.30196  

Windows and macOS

1

Acrobat Reader 2017

Classic 2017

2017.011.30196  

Windows and macOS

1

Vulnerability Details

Vulnerability Category Vulnerability Impact Severity CVE Number
Out-of-bounds Write
Arbitrary code execution
Important
CVE-2021-28561
Heap-based Buffer Overflow
Arbitrary code execution
Critical
CVE-2021-28560
Heap-based Buffer Overflow
Arbitrary code execution
Important 
CVE-2021-28558
Out-of-bounds Read
Memory leak
Critical
CVE-2021-28557
Out-of-bounds Read
Arbitrary file system read
Important 
CVE-2021-28555
Out-of-bounds Read
Arbitrary code execution
Critical 

CVE-2021-28565

Out-of-bounds Write
Arbitrary code execution
Critical 
CVE-2021-28564
Out-of-bounds Write
Arbitrary code execution
Critical

CVE-2021-21044

CVE-2021-21038

Exposure of Private Information
Privilege escalation
Important 

CVE-2021-28559

Use After Free
Arbitrary code execution
Critical 

CVE-2021-28562

CVE-2021-28550

CVE-2021-28553

Acknowledgements

Adobe would like to thank the following for reporting the relevant issues and for working with Adobe to help protect our customers. 

  • Anonymously reported (CVE-2021-28550)
  • Aleksandar Nikolic of Cisco Talos. (CVE-2021-28562)
  • Xu peng (xupeng_1231) (CVE-2021-28561)
  • chutchut (CVE-2021-28559)
  • fr0zenrain of Baidu Security (CVE-2021-28560)
  • Haboob Labs (CVE-2021-28557, CVE-2021-28564, CVE-2021-28565, CVE-2021-28553, , CVE-2021-28558, CVE-2021-28555)
Adobe logo

Sign in to your account