CVE-2025-25005

Microsoft Exchange Server Tampering Vulnerability

CVE-2025-25005 is fixed in 4 products on 1 platform, first by KB5063223, released August 12, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0145

73rd percentile

<p>Improper input validation in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5063223	Aug 12, 2025
Microsoft Exchange Server 2019 Cumulative Update 14	KB5063222	Aug 12, 2025
Microsoft Exchange Server 2019 Cumulative Update 15	KB5063221	Aug 12, 2025
Microsoft Exchange Server Subscription Edition RTM	KB5063224	Aug 12, 2025

Details

Published
August 12, 2025
Weakness
Improper Input Validation
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-25005

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