Microsoft · ServicingStack update · April 8, 2025
KB5055527: April 2025 cumulative update for Windows Server 23H2
KB5055527, released April 8, 2025, fixes 75 CVEs in Windows Server 2022, 23H2 Edition (Server Core installation) (build 25398.1551). One of them is being exploited (CVE-2025-29824); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now1 on CISA KEVKnown ransomware use1 publicly disclosedUnsupported product
CVEs closed
75
6 rated Critical
Exploited
1
CVE-2025-29824
Exploitation more likely
7
Vendor assessment
Highest EPSS
0.1925
97th percentile
Priority of the 75 CVEs
Patch now 1
Urgent 9
High 48
Routine 17
Applies to
| Product | Build after install |
|---|---|
| Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1551 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2025-29824 | Windows Common Log File System Driver | Elevation of Privilege | 7.8 | 0.1925 | KEVRansomwareExploited |
| Urgent | CVE-2025-27480 | Remote Desktop Gateway Service | Remote Code Execution | 8.1 | 0.1262 | More likely |
| Urgent | CVE-2025-26670 | Windows LDAP - Lightweight Directory Access Protocol | Remote Code Execution | 8.1 | 0.1105 | More likely |
| Urgent | CVE-2025-29809 | Windows Kerberos | Security Feature Bypass | 7.1 | 0.0426 | More likely |
| Urgent | CVE-2025-26663 | Windows LDAP - Lightweight Directory Access Protocol | Remote Code Execution | 8.1 | 0.0179 | More likely |
| Urgent | CVE-2025-27482 | Remote Desktop Gateway Service | Remote Code Execution | 8.1 | 0.0165 | More likely |
| Urgent | CVE-2025-27491 | Windows Hyper-V | Remote Code Execution | 7.1 | 0.0143 | Exploitation Less Likely |
| Urgent | CVE-2025-26686 | Windows TCP/IP | Remote Code Execution | 7.5 | 0.0142 | Exploitation Less Likely |
| Urgent | CVE-2025-27727 | Windows Installer | Elevation of Privilege | 7.8 | 0.0104 | More likely |
| Urgent | CVE-2025-29812 | Windows Kernel Memory | Elevation of Privilege | 7.8 | 0.0093 | More likely |
| High | CVE-2025-21204 | Windows Update Stack | Elevation of Privilege | 7.8 | 0.0713 | Exploitation Less Likely |
| High | CVE-2025-27740 | Windows Active Directory Certificate Services | Elevation of Privilege | 8.8 | 0.0352 | Exploitation Less Likely |
| High | CVE-2025-26673 | Windows LDAP - Lightweight Directory Access Protocol | Denial of Service | 7.5 | 0.0273 | Exploitation Less Likely |
| High | CVE-2025-29810 | Active Directory Domain Services | Elevation of Privilege | 7.5 | 0.0262 | Exploitation Less Likely |
| High | CVE-2025-27469 | Windows LDAP - Lightweight Directory Access Protocol | Denial of Service | 7.5 | 0.0257 | Exploitation Less Likely |
| High | CVE-2025-26647 | Windows Kerberos | Elevation of Privilege | 8.8 | 0.0230 | Exploitation Less Likely |
| High | CVE-2025-26641 | Windows Cryptographic Services | Denial of Service | 7.5 | 0.0227 | Exploitation Less Likely |
| High | CVE-2025-27473 | Windows HTTP.sys | Denial of Service | 7.5 | 0.0227 | Exploitation Less Likely |
| High | CVE-2025-27479 | Windows Kerberos | Denial of Service | 7.5 | 0.0227 | Exploitation Less Likely |
| High | CVE-2025-27477 | Windows Telephony Service | Remote Code Execution | 8.8 | 0.0161 | Exploitation Less Likely |
| High | CVE-2025-26669 | Windows Routing and Remote Access Service (RRAS) | Information Disclosure | 8.8 | 0.0153 | Exploitation Less Likely |
| High | CVE-2025-27487 | Remote Desktop Client | Remote Code Execution | 8.0 | 0.0152 | Exploitation Less Likely |
| High | CVE-2025-21205 | Windows Telephony Service | Remote Code Execution | 8.8 | 0.0139 | Exploitation Less Likely |
| High | CVE-2025-21221 | Windows Telephony Service | Remote Code Execution | 8.8 | 0.0139 | Exploitation Less Likely |
| High | CVE-2025-21222 | Windows Telephony Service | Remote Code Execution | 8.8 | 0.0139 | Exploitation Less Likely |
Showing 1 to 25 of 75
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