CVE-2025-59287: 
vulnerability analysis and mitigation

CVE-2025-59287 is a critical Remote Code Execution (RCE) vulnerability in the Windows Server Update Service (WSUS). The vulnerability was disclosed as part of Microsoft's October 2025 Patch Tuesday and was assigned a CVSSv3 score of 9.8. This vulnerability affects Windows systems running WSUS and allows an unauthorized attacker to execute code over a network through deserialization of untrusted data (Tenable, GBHackers).

The vulnerability stems from a deserialization issue in the Windows Server Update Service that permits unauthenticated remote code execution over networks. Microsoft has assessed this vulnerability as 'Exploitation More Likely' according to their Exploitability Index. The attack vector involves sending a crafted event that leads to a deserialization of untrusted data. This is notably the first RCE vulnerability in WSUS since 2023, when Microsoft previously patched two elevation of privilege vulnerabilities (CVE-2023-32056, CVE-2023-35317) (Tenable, Cybersecurity News).

The vulnerability's critical severity rating and high CVSS score of 9.8 indicate its significant potential impact. As an unauthenticated remote code execution vulnerability, successful exploitation could allow attackers to execute arbitrary code on affected systems without requiring any authentication. This poses a severe risk for supply-chain attacks through the Windows Update infrastructure (Bleeping Computer).

Microsoft has released a security patch for CVE-2025-59287 as part of the October 2025 Patch Tuesday updates. Organizations are strongly advised to prioritize the deployment of this patch due to the critical nature of the vulnerability. The update should be applied through Windows Update or Windows Server Update Services (WSUS). For enterprises, vulnerability management tools can be used to scan for affected versions and verify the successful application of patches (Bleeping Computer).