Full Report
The company has addressed zero-day vulnerabilities for eight consecutive months without deeming any of them critical at the time of disclosure. The post Microsoft’s Patch Tuesday closes 72 vulnerabilities, including 5 zero-days appeared first on CyberScoop.
Analysis Summary
# Vulnerability: Microsoft May 2025 Patch Tuesday Summary (Focus on 5 Active Zero-Days)
## CVE Details
- CVE ID: CVE-2025-30397, CVE-2025-30400, CVE-2025-32701, CVE-2025-32706, CVE-2025-32709 (Plus others mentioned, including 5 Criticals)
- CVSS Score: **7.5 to 7.8** (for the five zero-days listed) (Severity: High, based on score range)
- CWE: Multiple (including Use-After-Free, Memory Corruption)
## Affected Systems
- Products: Various Microsoft Core Products, including Windows Components. Specifically mentioned: Windows Common Log File Driver System (CLFS), Windows Desktop Window Manager (DWM), Windows Ancillary Function Driver for Windows Sockets API (WinSock), Microsoft Scripting Engine, and Microsoft SharePoint Server.
- Versions: All applicable Windows OS versions (specifics generally detailed in the MSRC guide).
- Configurations: Attack vectors vary; CLFS flaws lead to SYSTEM-level elevation.
## Vulnerability Description
Microsoft patched 72 vulnerabilities in total, notably five actively exploited Zero-Days. Two of these zero-days, **CVE-2025-32701** and **CVE-2025-32706**, affect the **Windows Common Log File Driver System (CLFS)** and typically lead to elevation of privilege to SYSTEM. **CVE-2025-30400** is a use-after-free vulnerability in the **Windows DWM**. **CVE-2025-32709** affects the **WinSock** driver (EoP). **CVE-2025-30397** is a scripting memory corruption defect in the **Microsoft Scripting Engine**. The report also highlights that other high-severity vulnerabilities affecting **SharePoint Server** (CVE-2025-29976, CVE-2025-30382) could lead to Privilege Escalation and Remote Code Execution (RCE).
## Exploitation
- Status: **Actively Exploited in the Wild** for all five listed zero-days (CISA KEV added all five). Note: CVE-2025-30397 is RCE but requires user interaction and is complex.
- Complexity: **Low to Medium** for CLFS flaws (minimal privileges needed for EoP). **High** for CVE-2025-30397.
- Attack Vector: Varies. CLFS flaws often follow initial compromise, leading to local privilege escalation. CVE-2025-30397 is likely via the Network/Remote vector requiring user interaction.
## Impact
- Confidentiality: High (SYSTEM-level compromise allows full system access).
- Integrity: High (SYSTEM-level compromise allows modification/disabling of security protections).
- Availability: High (SYSTEM-level compromise allows denial of service or malware installation).
## Remediation
### Patches
- Immediate action required for the five zero-days: **CVE-2025-30397, CVE-2025-30400, CVE-2025-32701, CVE-2025-32706, CVE-2025-32709**.
- Patches are available via the **May 2025 Microsoft Security Update release**.
- Priority should be given to the 5 Critical and 50 High-severity patches mentioned.
- Microsoft designated 8 vulnerabilities (including three Office CVEs: CVE-2025-29792, CVE-2025-29793, CVE-2025-29794) as "more likely" to be exploited.
### Workarounds
- No specific workarounds are detailed in the summary for the five zero-days, but patching is strongly indicated due to active exploitation and CISA KEV inclusion.
## Detection
- Indicators of Compromise: Likely related to **SYSTEM-level privilege escalation** activity following initial foothold, potentially involving ransomware deployment or targeted espionage activities (as previously seen with prior CLFS flaws like CVE-2025-29824).
- Detection Methods and Tools: Utilize advanced endpoint detection and response (EDR) tools configured to monitor for suspicious activity involving the **CLFS driver** and unexpected kernel-level process execution or privilege elevation attempts.
## References
- Vendor Advisories: [msrc-microsoft-com/update-guide/releaseNote/2025-May]
- CISA KEV: [cisa-gov/known-exploited-vulnerabilities-catalog]
- Vulnerability Details (Examples):
- [nvd-nist-gov/vuln/detail/CVE-2025-32701]
- [nvd-nist-gov/vuln/detail/CVE-2025-30400]