CVE-2025-27491: 
vulnerability analysis and mitigation

CVE-2025-27491 is a Critical Remote Code Execution (RCE) vulnerability discovered in Windows Hyper-V, disclosed on April 8, 2025. This use-after-free vulnerability affects Windows Hyper-V systems and has been assigned a CVSS score of 7.1 (NVD, CrowdStrike).

The vulnerability is classified as a use-after-free issue, which occurs when programs access already-freed memory. The vulnerability requires an authenticated attacker with guest privileges to execute arbitrary code over a network. Exploitation requires winning a race condition, which makes successful exploitation less likely. The vulnerability has been assigned a CVSS v3.1 base score of 7.1 HIGH with the vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H (NVD, CrowdStrike).

If successfully exploited, this vulnerability allows an authenticated attacker with guest privileges to execute arbitrary code over a network. The attacker must convince a victim to open a malicious site to initiate the exploit. The high CVSS score indicates potential severe impacts on system confidentiality, integrity, and availability (CrowdStrike).

Microsoft has released security updates as part of the April 2025 Patch Tuesday to address this vulnerability. Organizations are advised to apply the security updates promptly to affected Windows Hyper-V systems (Microsoft MSRC).