CVE-2025-24072 is a use-after-free vulnerability classified under CWE-416 found in the Microsoft Local Security Authority Server (lsasrv) component of Windows 10 Version 1809 (build 17763.0). This vulnerability arises when the lsasrv improperly handles memory, freeing an object while it is still in use, which can lead to memory corruption. An authorized attacker with local access and low privileges can exploit this flaw to elevate their privileges to SYSTEM level, gaining full control over the affected system. The attack does not require user interaction, increasing its risk in environments where local access is possible. The vulnerability impacts confidentiality, integrity, and availability severely, as it allows attackers to bypass security controls and potentially deploy further malicious actions. Although no exploits have been observed in the wild yet, the vulnerability is publicly known and rated with a CVSS 3.1 score of 7.8, indicating high severity. The lack of available patches at the time of publication means organizations must rely on interim mitigations. The vulnerability specifically affects Windows 10 Version 1809, a legacy version still used in some enterprise environments, particularly where upgrade cycles are slow or constrained by compatibility requirements.

For European organizations, this vulnerability poses a significant risk, especially for those still running Windows 10 Version 1809 in production environments. Successful exploitation can lead to full system compromise, allowing attackers to access sensitive data, disrupt operations, or deploy ransomware and other malware. Critical infrastructure sectors such as finance, healthcare, government, and manufacturing are particularly vulnerable due to their reliance on Windows systems and the potential impact of privilege escalation on operational continuity and data confidentiality. The local attack vector means that insider threats or attackers who gain initial foothold through other means (e.g., phishing, physical access) can leverage this vulnerability to escalate privileges and move laterally within networks. The absence of known exploits in the wild provides a window for proactive defense, but the high impact necessitates urgent attention to mitigate risks. Legacy systems in regulated industries may face compliance challenges if this vulnerability is not addressed promptly.

1. Restrict local access to systems running Windows 10 Version 1809 by enforcing strict access controls and monitoring for unauthorized logins. 2. Apply the principle of least privilege to limit user permissions, reducing the likelihood that an attacker can exploit this vulnerability. 3. Implement robust endpoint detection and response (EDR) solutions to identify suspicious activities indicative of privilege escalation attempts. 4. Prepare for patch deployment by closely monitoring Microsoft security advisories and testing updates in controlled environments to ensure compatibility. 5. Consider accelerating migration plans away from Windows 10 Version 1809 to supported versions with active security updates. 6. Use application whitelisting and restrict execution of untrusted code to reduce the attack surface. 7. Conduct regular security awareness training to minimize insider threats and educate users about the risks of local privilege escalation. 8. Employ network segmentation to limit lateral movement in case of compromise. 9. Maintain up-to-date backups and incident response plans to mitigate potential damage from exploitation.