Microsoft · Security update · August 12, 2025
KB5063221: August 2025 security update
KB5063221, released August 12, 2025, fixes 4 CVEs in Microsoft Exchange Server 2019 Cumulative Update 15. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
4
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.0145
73rd percentile
Priority of the 4 CVEs
Patch now 0
Urgent 0
High 1
Routine 3
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2025-33051 | Microsoft Exchange Server | Information Disclosure | 7.5 | 0.0139 | Exploitation Less Likely |
| Routine | CVE-2025-25005 | Microsoft Exchange Server | Tampering | 6.5 | 0.0145 | Exploitation Less Likely |
| Routine | CVE-2025-25006 | Microsoft Exchange Server | Spoofing | 5.3 | 0.0092 | Exploitation Less Likely |
| Routine | CVE-2025-25007 | Microsoft Exchange Server | Spoofing | 5.3 | 0.0090 | Exploitation Less Likely |
Showing 1 to 4 of 4
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