Microsoft Exchange Server 2013 Cumulative Update 23

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• High 8.8
  CVE-2023-21529 Exploited · Ransomware EPSS 59%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 12
  Feb 14, 2023

  KEV Apr 13, 2026
• High 8.8
  CVE-2022-41080 Exploited · Ransomware Public exploit EPSS 77%

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 12
  Nov 9, 2022

  KEV Jan 10, 2023
• High 8.8
  CVE-2022-41040 Exploited · Ransomware Public exploit EPSS 100%

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 12
  Oct 3, 2022

  KEV Sep 30, 2022
• High 8.0
  CVE-2022-41082 Exploited · Ransomware Public exploit EPSS 100%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 12
  Oct 3, 2022

  KEV Sep 30, 2022
• Critical 9.0
  CVE-2021-34523 Exploited · Ransomware Public exploit EPSS 100%

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Exchange Server Elevation of Privilege Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  Jul 14, 2021

  KEV Nov 3, 2021
• Critical 9.1
  CVE-2021-34473 Exploited · Ransomware Public exploit Scanner template EPSS 100%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 8 Microsoft Exchange Server 2016 Cumulative Update 19
  Jul 14, 2021

  KEV Nov 3, 2021
• High 7.3
  CVE-2021-33766 Exploited Public exploit Scanner template EPSS 98%

  Microsoft Exchange Server Information Disclosure Vulnerability

  Microsoft Exchange Server Information Disclosure Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 8 Microsoft Exchange Server 2016 Cumulative Update 19
  Jul 14, 2021

  KEV Jan 18, 2022
• High 7.2
  CVE-2021-31196 Exploited EPSS 54%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 10 Microsoft Exchange Server 2016 Cumulative Update 21
  Jul 14, 2021

  KEV Aug 21, 2024
• Medium 6.6
  CVE-2021-31207 Exploited · Ransomware Public exploit EPSS 100%

  Microsoft Exchange Server Security Feature Bypass Vulnerability

  Microsoft Exchange Server Security Feature Bypass Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  May 11, 2021

  KEV Nov 3, 2021
• High 7.8
  CVE-2021-27065 Exploited · Ransomware Public exploit EPSS 100%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  Mar 2, 2021

  KEV Nov 3, 2021
• High 7.8
  CVE-2021-26858 Exploited · Ransomware EPSS 94%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  Mar 2, 2021

  KEV Nov 3, 2021
• Critical 9.1
  CVE-2021-26855 Exploited · Ransomware Public exploit Scanner template EPSS 100%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  Mar 2, 2021

  KEV Nov 3, 2021
• High 7.8
  CVE-2021-26857 Exploited · Ransomware Public exploit EPSS 96%

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Exchange Server Remote Code Execution Vulnerability

  Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2019 Cumulative Update 8
  Mar 2, 2021

  KEV Nov 3, 2021