CVE-2025-53772 is a critical vulnerability classified under CWE-502 (Deserialization of Untrusted Data) affecting Microsoft Web Deploy 4.0, specifically version 10.0.2000. Web Deploy is a Microsoft tool used for simplifying the deployment of web applications and services. The vulnerability arises because the product improperly handles deserialization of data received over the network, allowing an attacker with authorized access to send crafted serialized objects that, when deserialized, lead to arbitrary code execution. The attack vector is network-based with low attack complexity and requires privileges (PR:L) but no user interaction (UI:N). The vulnerability impacts confidentiality, integrity, and availability (all rated high) since arbitrary code execution can lead to full system compromise. The CVSS v3.1 base score is 8.8, reflecting the severity and ease of exploitation. Although no public exploits are reported yet, the vulnerability is published and should be treated as a serious threat. The lack of available patches at the time of reporting means organizations must implement interim mitigations. The flaw is particularly dangerous in environments where Web Deploy is exposed to untrusted networks or where multiple users have deployment privileges. Attackers could leverage this vulnerability to deploy malware, steal sensitive data, or disrupt services remotely.

For European organizations, the impact of CVE-2025-53772 could be severe, especially for enterprises and public sector entities relying on Microsoft Web Deploy for application deployment and management. Successful exploitation could lead to unauthorized remote code execution, enabling attackers to gain control over web servers, manipulate or steal sensitive data, disrupt services, or move laterally within networks. This could affect critical infrastructure, financial institutions, healthcare providers, and government agencies that use Web Deploy in their IT operations. The high severity and network-based attack vector increase the risk of widespread exploitation if the vulnerability is not promptly addressed. Additionally, the requirement for authorized access means insider threats or compromised credentials could facilitate attacks. The absence of known exploits currently provides a window for proactive defense, but the potential for rapid weaponization exists given the nature of the vulnerability.

1. Immediately restrict network access to Microsoft Web Deploy services to trusted administrators only, using firewalls and network segmentation. 2. Enforce strict access controls and multi-factor authentication for all users with deployment privileges to reduce risk from compromised credentials. 3. Monitor Web Deploy logs and network traffic for unusual or unauthorized activity indicative of exploitation attempts. 4. Apply any patches or security updates released by Microsoft for Web Deploy 4.0 as soon as they become available. 5. If patching is not immediately possible, consider disabling or uninstalling Web Deploy on non-essential systems or those exposed to untrusted networks. 6. Conduct regular security audits and vulnerability assessments focusing on deployment infrastructure. 7. Educate IT staff about the risks of deserialization vulnerabilities and ensure secure coding and deployment practices are followed. 8. Implement endpoint detection and response (EDR) solutions to detect and respond to suspicious behaviors related to this vulnerability.