EUVD-2025-17793CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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3Tags
Description
Missing release of memory after effective lifetime in Windows Cryptographic Services allows an unauthorized attacker to execute code over a network.
Analysis
Memory management vulnerability in Windows Cryptographic Services where memory is not properly released after its effective lifetime, enabling unauthenticated remote code execution. The vulnerability affects Windows cryptographic components and allows network-based attackers to execute arbitrary code with high complexity requirements. While the CVSS score of 8.1 indicates significant severity, exploitation requires specific conditions (high attack complexity), and current status regarding KEV listing, EPSS score, and public POC availability is unknown pending official Microsoft advisory release.
Technical Context
This vulnerability involves CWE-401 (Missing Release of Memory After Effective Lifetime), a memory management defect in the Windows Cryptographic Services subsystem. The root cause is improper cleanup of cryptographic objects or buffers after their intended use, potentially within legacy cryptographic protocol handlers, certificate validation routines, or key management functions. The Windows Cryptographic Services (CNG - Cryptography Next Generation, or legacy CryptoAPI) process sensitive cryptographic data; failure to zero or deallocate memory containing key material, plaintexts, or intermediate values creates a use-after-free or memory disclosure condition. Affected CPE would typically match 'cpe:2.3:o:microsoft:windows:*' across multiple versions, requiring Microsoft's official advisory for precise version ranges. The network attack vector suggests exploitation through cryptographic protocol negotiation or remote cryptographic operations.
Affected Products
Based on the CVE description, affected products include: Microsoft Windows Cryptographic Services (CNG/CryptoAPI subsystem). Precise affected versions pending official Microsoft Security Advisory. Likely affected Windows versions include Windows Server 2016, 2019, 2022, and consumer Windows 10/11 builds, but exact version and build ranges require Microsoft's advisory. CPE string pattern expected: 'cpe:2.3:o:microsoft:windows:*' with specific version constraints. Components within Windows Cryptographic Services handling TLS/SSL, certificate validation, smart card operations, or key derivation are suspected entry points. No third-party library alternates; this is a core OS component. Recommend consulting Microsoft Security Update Guide and official KB articles once published for definitive version mappings.
Remediation
Immediate actions: (1) Monitor Microsoft Security Response Center (MSRC) and Windows Update for emergency security patch release targeting CVE-2025-29828; (2) Enable Windows Update automatic patching immediately upon availability; (3) Prioritize patch deployment for Windows Server systems handling authentication or cryptographic operations. Interim mitigations pending patch: (a) Restrict network access to cryptographic services via firewall rules; (b) Disable legacy cryptographic protocols (SSLv3, early TLS versions) if not required; (c) Review and minimize exposure of certificate services and smart card authentication endpoints; (d) Monitor for unusual cryptographic operation failures or memory-related crashes in Event Viewer (System and Application logs). Once patch details are published by Microsoft, apply to all affected Windows versions across the environment. Workarounds are unlikely given the OS-level nature of the vulnerability; patching is the primary remediation path.
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