Microsoft Exchange Server 2016 Cumulative Update 21

16 known vulnerabilities.

Microsoft Exchange Server 2016 Cumulative Update 21 at a glance

Last 12 months: 0
Critical · all time: 4
Exploited · all time: 2
Public exploit · all time: 4

1 of the exploited vulnerabilities are known to be used by ransomware (CISA).

New vulnerabilities per month · last 2412 months

Show as table

Month	Vulnerabilities	Critical
Nov 2026	0	0
Oct 2026	0	0
Sep 2026	0	0
Aug 2026	0	0
Jul 2026	0	0
Jun 2026	0	0
May 2026	0	0
Apr 2026	0	0
Mar 2026	0	0
Feb 2026	0	0
Jan 2026	0	0
Dec 2025	0	0
Nov 2025	0	0
Oct 2025	0	0
Sep 2025	0	0
Aug 2025	0	0
Jul 2025	0	0
Jun 2025	0	0
May 2025	0	0
Apr 2025	0	0
Mar 2025	0	0
Feb 2025	0	0
Jan 2025	0	0
Dec 2024	0	0

All Critical High Medium Low Exploited only Public exploit

16 results · Feed

Medium 6.5

CVE-2022-24463 EPSS 32%

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22 Microsoft Exchange Server 2019 Cumulative Update 10

Mar 9, 2022
High 8.8

CVE-2022-23277 Public exploit EPSS 41%

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 11 Microsoft Exchange Server 2016 Cumulative Update 22

Mar 9, 2022
Critical 9.0

CVE-2022-21969

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 11 Microsoft Exchange Server 2016 Cumulative Update 22

Jan 11, 2022
Critical 9.0

CVE-2022-21855

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 11 Microsoft Exchange Server 2016 Cumulative Update 22

Jan 11, 2022
Critical 9.0

CVE-2022-21846

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 11 Microsoft Exchange Server 2016 Cumulative Update 22

Jan 11, 2022
High 8.8

CVE-2021-42321 Exploited · Ransomware Public exploit EPSS 92%

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22 Microsoft Exchange Server 2016 Cumulative Update 21

Nov 10, 2021
KEV Nov 17, 2021
Medium 6.5

CVE-2021-42305

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22

Nov 10, 2021
Medium 6.5

CVE-2021-41349 Public exploit Scanner template EPSS 93%

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22

Nov 10, 2021
Medium 6.5

CVE-2021-41350

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22 Microsoft Exchange Server 2019 Cumulative Update 10

Oct 13, 2021
High 8.0

CVE-2021-41348

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22 Microsoft Exchange Server 2019 Cumulative Update 10

Oct 13, 2021
High 7.5

CVE-2021-34453

Microsoft Exchange Server Denial of Service Vulnerability

Microsoft Exchange Server Denial of Service Vulnerability

Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 Microsoft Exchange Server 2016 Cumulative Update 22 Microsoft Exchange Server 2016 Cumulative Update 21

Oct 13, 2021
Critical 9.0

CVE-2021-26427

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 11 Microsoft Exchange Server 2016 Cumulative Update 22

Oct 13, 2021
High 8.0

CVE-2021-34470 Public exploit

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 21 Microsoft Exchange Server 2019 Cumulative Update 10

Jul 14, 2021
High 8.0

CVE-2021-33768

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 21 Microsoft Exchange Server 2019 Cumulative Update 10 Microsoft Exchange Server 2019 Cumulative Update 9

Jul 14, 2021
High 7.6

CVE-2021-31206 EPSS 13%

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
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 2016 Cumulative Update 21 Microsoft Exchange Server 2019 Cumulative Update 10

Jul 14, 2021
KEV Aug 21, 2024

Microsoft Exchange Server 2016 Cumulative Update 21

Microsoft Exchange Server 2016 Cumulative Update 21 at a glance

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Exchange Server Denial of Service Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability