CVE-2025-25007

Microsoft Exchange Server Spoofing Vulnerability

CVE-2025-25007 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

5.3

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0090

59th percentile

<p>Improper validation of syntactic correctness of input in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing 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 Validation of Syntactic Correctness of Input
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-25007

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