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Exchange Server 2019 CU14 Exchange Server 2019 CU14 ESU only Security update
Patch Tuesday

KB5063222

KB5063222: Security update for Exchange Server 2019 CU14, August 2025. Four server flaws addressed; eDiscovery exports restored

In short

The update addresses four Important vulnerabilities and fixes eDiscovery export problems. It is available only to organizations in the Extended Security Update program.

Does it affect you? Applies to: Exchange Server 2019 CU14 (x64), build 15.2.1544.33. The product is out of support; this update is available only to organizations in the Extended Security Update program.

Build
15.2.1544.33
Servicing branch
CU14
Security
4 fixed
Review notes Additional details from the official release notes (1) Read note
  • Does it affect you? The supplied sources identify this as an ESU-only update, but do not establish that Exchange Server 2019 was already out of support on August 12, 2025.

The official sources are linked at the end of the page.

For servers running Cumulative Update 14: each cumulative update gets its own update. Support for this version ended on October 14, 2025: Microsoft releases this update only to organizations enrolled in the Extended Security Update (ESU) program, not through Microsoft Update. The others should move to Exchange Server Subscription Edition. Which version am I on?

What changes

Fixes 3 changes

eDiscovery

  • eDiscovery search results can be exported to a discovery mailbox again.1

Application pools

  • Application pools no longer stop responding and affect performance after MSIPC is enabled.2

Public folder management

  • Public folder management in Outlook no longer modifies the incorrect ACE.3

Improvement 1 change

Security update replacement

  • This update replaces KB5049233.4

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-08-12
Classification
Security Updates
Type
Cumulative update
Servicing branch
CU14
Replaces
KB5057652
Replaced by
KB5066371
VersionBuildChannel
2019 15.2.1544.33 General availability

Security

4 vulnerabilities fixed
4 important
VulnerabilitySeverityCVSS
CVE-2025-33051
Microsoft Exchange Server Information Disclosure Vulnerability
 Important 7.5
CVE-2025-25005
Microsoft Exchange Server Tampering Vulnerability
 Important 6.5
CVE-2025-25006
Microsoft Exchange Server Spoofing Vulnerability
 Important 5.3
CVE-2025-25007
Microsoft Exchange Server Spoofing Vulnerability
 Important 5.3

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. Exchange Server fails to export eDiscovery search results to a discovery mailbox support.microsoft.com
  2. 2. Application pools stop responding and performance is affected after MSIPC is enabled support.microsoft.com
  3. 3. Incorrect ACE is modified through public folder management in Outlook support.microsoft.com
  4. 4. This security update replaces the following previously released updates: support.microsoft.com
Checked automatically: 7 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: not passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake