Full Report
Microsoft on Tuesday released software updates to fix at least 70 vulnerabilities in Windows and related products, including five zero-day flaws that are already seeing active exploitation. Adding to the sense of urgency with this month's patch batch from Redmond are fixes for two other weaknesses that now have public proof-of-concept exploits available.
Analysis Summary
# Vulnerability: Microsoft Windows Zero-Day Elevation of Privilege Flaws (May 2025 Patch Tuesday)
## CVE Details
- CVE ID: CVE-2025-32701, CVE-2025-32706, CVE-2025-32709, CVE-2025-30400, CVE-2025-30397 (and 65 others)
- CVSS Score: Not explicitly listed for most, but 5 zero-days are actively exploited.
- CWE: Not explicitly listed, but flaws involve Driver vulnerability (CLFS) and Privilege Elevation.
## Affected Systems
- Products: Windows (all supported versions of Windows 10, Windows 11, and Server versions), AFD.sys, Desktop Window Manager (DWM) library, Microsoft Scripting Engine (used by Internet Explorer/IE Mode in Edge).
- Versions: All supported versions of Windows 10/11/Server.
- Configurations: General system component flaws.
## Vulnerability Description
Microsoft patched five specific zero-day vulnerabilities that are actively being exploited.
1. **CVE-2025-32701 & CVE-2025-32706:** Flaws in the Windows Common Log File System (CLFS) driver, a critical component for logging services. These allow an attacker with existing access to elevate privileges to the highly privileged Windows SYSTEM account.
2. **CVE-2025-32709:** An Elevation of Privilege (EoP) flaw concerning `afd.sys` (Windows Ancillary Function Driver), which manages internet connectivity.
3. **CVE-2025-30400:** An EoP flaw in the Desktop Window Manager (DWM) library.
4. **CVE-2025-30397:** A flaw in the Microsoft Scripting Engine components used by Internet Explorer and IE Mode in Microsoft Edge.
## Exploitation
- Status: **Actively exploited in the wild** (for the five zero-days identified). PoC exploits are available for at least two other weaknesses patched this cycle.
- Complexity: Privilege escalation bugs typically assume the attacker already has initial access.
- Attack Vector: Local/Indirect (requires pre-existing access, such as from a successful phishing attack or stolen credentials).
## Impact
- Confidentiality: High (SYSTEM access allows for credential harvesting and further compromise).
- Integrity: High (SYSTEM access allows attackers to disable security tooling/software).
- Availability: Medium/High (SYSTEM access grants ability to disrupt core system functions).
## Remediation
### Patches
- Apply the latest cumulative update released by Microsoft for the affected Windows operating systems. (Specific patch KB numbers are not detailed in the source, refer to the MSRC advisory).
### Workarounds
- None explicitly provided by the vendor; immediate patching is the **only mitigation** recommended due to active exploitation.
## Detection
- Status: No specific Indicators of Compromise (IOCs) were shared in the patch notes.
- Detection methods and tools: Security teams must rely on applying vendor patches immediately, as no threat intelligence details were available for defensive scanning outside of the patch itself.
## References
- MSRC Advisory for CVE-2025-32701 (defanged): msrc.microsoft.com/update-guide/en-us/advisory/CVE-2025-32701
- MSRC Advisory for CVE-2025-32706 (defanged): msrc.microsoft.com/update-guide/en-us/advisory/CVE-2025-32706
- MSRC Advisory for CVE-2025-32709 (defanged): msrc.microsoft.com/update-guide/en-us/advisory/CVE-2025-32709
- MSRC Advisory for CVE-2025-30400 (defanged): msrc.microsoft.com/update-guide/en-us/advisory/CVE-2025-30400
- MSRC Advisory for CVE-2025-30397 (defanged): msrc.microsoft.com/update-guide/en-us/advisory/CVE-2025-30397
- Rapid7 Reference (defanged): rapid7.com/blog/post/2024/05/14/patch-tuesday-may-2024/
- Recall Feature Teardown (defanged): cyberplace.social/114360483150635243