Full Report
Microsoft Patch Tuesday for April 2025 included fixes for 135 vulnerabilities in all, including one actively exploited zero-day and an additional 11 high-risk vulnerabilities. In all, Patch Tuesday April 2025 included 126 Microsoft vulnerabilities and nine Chrome/Microsoft Edge vulnerabilities. The zero-day is a 7.8-rated Windows Common Log File System Driver use-after-free vulnerability that the U.S. Cybersecurity and Infrastructure Security Agency (CISA) promptly added to its Known Exploited Vulnerabilities (KEV) catalog. The vulnerability, CVE-2025-29824, could allow an attacker to elevate privileges locally. Microsoft revealed that the vulnerability has been exploited in ransomware attacks. The single zero-day vulnerability marks a significant decline from the six reported in March. So far this year, Microsoft has reported 405 vulnerabilities in its Patch Tuesday reports, including 12 actively exploited zero days. Patch Tuesday April 2025 High-Risk Vulnerabilities The 11 vulnerabilities labeled “Exploitation More Likely” range in severity from 5.4 (a Windows Mark of the Web Security Feature Bypass vulnerability) to 8.8 (a SharePoint Remote Code Execution vulnerability), and another four are rated 8.1. The high-risk vulnerabilities include: CVE-2025-29794: SharePoint Remote Code Execution (RCE) Vulnerability (8.8) CVE-2025-29793: Microsoft SharePoint Remote Code Execution Vulnerability (7.2) CVE-2025-26663: Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability (8.1) CVE-2025-26670: LDAP Client Remote Code Execution Vulnerability (8.1) CVE-2025-27480: Windows Remote Desktop Services Remote Code Execution Vulnerability (8.1) CVE-2025-27482: Windows Remote Desktop Services Remote Code Execution Vulnerability (8.1) CVE-2025-27727: Windows Installer Elevation of Privilege Vulnerability (7.8) CVE-2025-29792: Microsoft Office Elevation of Privilege Vulnerability (7.3) CVE-2025-29809: Windows Kerberos Security Feature Bypass Vulnerability (7.1) CVE-2025-29812: DirectX Graphics Kernel Elevation of Privilege Vulnerability (7.8) CVE-2025-27472: Windows Mark of the Web Security Feature Bypass Vulnerability (5.4) Other Vendors Issuing Patches The second Tuesday of the month is a day when other IT vendors issue patches too, and April 2025 is no exception. Among the other vendors and projects issuing patches within the last day were: Android Fortinet Ivanti SAP
Analysis Summary
This summary focuses on the identified Microsoft vulnerabilities from the April 2025 Patch Tuesday, as detailed in the provided context.
# Vulnerability: Microsoft Patch Tuesday April 2025 Summary
## CVE Details
The article mentions several CVEs associated with Microsoft Patch Tuesday, April 2025, primarily rated as High severity (8.1).
- CVE ID: **CVE-2025-26667**
- CVSS Score: **8.1** (High)
- CWE: Remote Code Execution Vulnerability (Implied)
- CVE ID: **CVE-2025-26670**
- CVSS Score: **8.1** (High)
- CWE: LDAP Client Remote Code Execution Vulnerability
- CVE ID: **CVE-2025-27480**
- CVSS Score: **8.1** (High)
- CWE: Windows Remote Desktop Services Remote Code Execution Vulnerability
- CVE ID: **CVE-2025-27482**
- CVSS Score: **8.1** (High)
- CWE: Windows Remote Desktop Services Remote Code Execution Vulnerability
- CVE ID: **CVE-2025-27727**
- CVSS Score: **7.8** (High)
- CWE: Windows Installer Elevation of Privilege Vulnerability
- CVE ID: **CVE-2025-29792**
- CVSS Score: **7.3** (High)
- CWE: Microsoft Office Elevation of Privilege Vulnerability
- CVE ID: **CVE-2025-29809**
- CVSS Score: **7.1** (High)
- CWE: Windows Kerberos Security Feature Bypass Vulnerability
- CVE ID: **CVE-2025-29812**
- CVSS Score: **7.8** (High)
- CWE: DirectX Graphics Kernel Elevation of Privilege Vulnerability
- CVE ID: **CVE-2025-27472**
- CVSS Score: **5.4** (Medium/Moderate)
- CWE: Windows Mark of the Web Security Feature Bypass Vulnerability
*Note: The article states one zero-day was patched, but does not explicitly identify which CVE corresponds to the zero-day in the provided snippet.*
## Affected Systems
- Products: Microsoft Windows, Microsoft Office, LDAP Client, Windows Remote Desktop Services, DirectX.
- Versions: Specific versions are not detailed in the snippet; users should consult MSRC guidance based on the CVE IDs listed.
- Configurations: Specific configurations are not provided, but vulnerabilities target specific service components (e.g., RDP, LDAP).
## Vulnerability Description
The summary indicates a mix of critical flaws patched in April 2025, including multiple **Remote Code Execution (RCE)** vulnerabilities in Windows RDP services and LDAP, **Elevation of Privilege (EoP)** flaws in Windows Installer, DirectX Graphics Kernel, and Microsoft Office, as well as a **Security Feature Bypass** in Kerberos and the Mark of the Web detection mechanism.
## Exploitation
- Status: The introductory text mentions **One Zero-Day** vulnerability was patched, suggesting at least one flaw was being actively exploited in the wild before patching. Other vulnerabilities may have Proof-of-Concept (PoC) code available or pending release, standard for high-severity patches.
- Complexity: Varies by CVE. RCE flaws typically require **Medium** to **Low** complexity if exploitation is trivial (as implied by the zero-day status).
- Attack Vector: RCE/RDP vulnerabilities suggest **Network** attack vectors. EoP vulnerabilities typically require **Local** access or prior compromise.
## Impact
Impact varies by the specific CVE, but RCE and EoP flaws suggest severe consequences:
- Confidentiality: **High** (Especially for RCE exploitation).
- Integrity: **High** (RCE and EoP allow unauthorized modification).
- Availability: **High** (Exploitation via RCE could lead to system instability or denial of service).
## Remediation
### Patches
Patches are available via the April 2025 Microsoft Patch Tuesday updates, corresponding to each CVE ID listed above. Users must apply the relevant MSRC updates.
- **Specific Patch Versions:** Not detailed in the summary; refer to MSRC GUIDANCE for specific product/version fixes.
### Workarounds
The summary does not explicitly list workarounds for the Microsoft flaws, but generally, for RDP vulnerabilities, disabling RDP services or using network access controls (firewalling access) are standard temporary mitigations until patching occurs.
## Detection
- Indicators of Compromise (IoCs): Not provided in the summary snippet.
- Detection methods and tools: Standard endpoint detection and response (EDR) tools and network monitoring should be used to search for attack patterns related to the specific services targeted (e.g., suspicious activity related to LDAP queries or RDP connection attempts followed by process execution).
## References
- Vendor advisories: Microsoft Security Update Guide (MS GUIDE) for April 2025.
- Relevant links - defanged:
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-26667
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-26670
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-27480
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-27482
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-27727
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-29792
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-29809
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-29812
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-27472
- thecyberexpress.com/microsoft-patch-tuesday-april-2025/ (For overall context)