Microsoft has announced an emergency fix for a critical vulnerability, CVE-2025-59287, affecting Windows Server users, specifically within the Windows Server Update Service (WSUS). The Cybersecurity and Infrastructure Security Agency (CISA) has indicated that attacks exploiting this vulnerability are already occurring. The WSUS Server Role is not enabled by default, meaning only servers with this role activated are at risk unless the fix is applied. CISA has mandated that certain federal agencies address this issue within two weeks and advises organizations to follow Microsoft's guidance to prevent unauthorized remote code execution. Recommended steps include identifying vulnerable servers, applying the security update released on October 23, 2025, and rebooting WSUS servers post-installation. For those unable to update immediately, disabling the WSUS server role and blocking inbound traffic to ports 8530 and 8531 is advised.