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Hvci Bypass (4K)

| CVE ID | Year | Impact | Key Insight | |--------|------|--------|--------------| | CVE-2016-0181 | 2016 | Allowed RWX kernel page marking | HVCI protection mechanism could be bypassed by a crafted application | | CVE-2024-21305 | 2024 | Arbitrary kernel code execution | Non-secure HVCI configuration allowed root partition compromise | | CVE-2024-21431 | 2024 | Security feature bypass | Low-privilege attacker could bypass HVCI | | CVE-2025-59033 | 2025 | WDAC/HVCI bypass | Driver blocklist bypass on systems without HVCI | | CVE-2025-7771 | 2025 | Physical memory read/write | Signed ThrottleStop.sys used for kernel escalation |

This is the most common "entry point." An attacker loads a legitimate, digitally signed driver that has a known security flaw (like an arbitrary memory write).While HVCI prevents the attacker from running code through that driver easily, they can use the driver's legitimate access to modify system configurations or manipulate memory in ways the hypervisor hasn't specifically restricted. 3. Return-Oriented Programming (ROP) in the Kernel Hvci Bypass

Microsoft employs "Warbird," an obfuscation framework to protect sensitive kernel drivers like clipsp.sys by encrypting sections and decrypting them at runtime. Recent research has focused on how Warbird effectively bypasses HVCI by creating dynamic writable-executable memory (W^X exceptions), a concept that HVCI strictly prohibits. Security analysts are reverse-engineering the Warbird decryption routine to execute arbitrary dynamic code inside the VTL0 kernel, abusing the very mechanisms Microsoft uses for its own protective software. | CVE ID | Year | Impact |