CVE-2024-30029 is a high-severity remote code execution vulnerability affecting Microsoft Windows 10 Version 1809, specifically within the Routing and Remote Access Service (RRAS). The root cause is a numeric truncation error (CWE-197), which occurs when a numeric value is improperly truncated, potentially leading to memory corruption or unexpected behavior. This vulnerability allows an unauthenticated attacker to remotely execute arbitrary code on a vulnerable system by sending specially crafted network packets to the RRAS component. Exploitation requires network access (AV:N) but has a high attack complexity (AC:H), meaning the attacker must overcome certain conditions or perform precise actions to exploit the flaw. No privileges or prior authentication are required (PR:N), but user interaction is needed (UI:R), likely involving some form of user-triggered network activity or acceptance of a connection. The vulnerability impacts confidentiality, integrity, and availability (C:H/I:H/A:H), indicating that successful exploitation could lead to full system compromise, data theft, or denial of service. The scope is unchanged (S:U), meaning the vulnerability affects only the vulnerable component without extending to other system components. Although no known exploits are currently in the wild, the presence of a numeric truncation error in a critical network service like RRAS makes this a significant risk, especially since Windows 10 Version 1809 is still in use in some environments. The lack of available patches at the time of publication increases exposure. The vulnerability was reserved in March 2024 and published in May 2024, reflecting recent discovery and disclosure.

For European organizations, this vulnerability poses a substantial risk, particularly for enterprises and public sector entities that still operate Windows 10 Version 1809 in their infrastructure. RRAS is commonly used to provide VPN and routing services, which are critical for remote access and network segmentation. Exploitation could allow attackers to gain remote control over affected systems without authentication, potentially leading to lateral movement within networks, data exfiltration, or disruption of critical services. Given the high confidentiality, integrity, and availability impact, organizations could face severe operational disruptions, regulatory compliance issues (e.g., GDPR breaches), and reputational damage. Sectors such as finance, healthcare, government, and critical infrastructure are especially vulnerable due to their reliance on secure remote access solutions and the sensitivity of their data. The requirement for user interaction may limit mass exploitation but does not eliminate targeted attacks, especially spear-phishing or social engineering campaigns that could induce user actions triggering the vulnerability.

1. Immediate prioritization of patching: Although no patch links are provided, organizations should monitor Microsoft’s official security advisories and deploy updates as soon as they become available. 2. Network segmentation: Restrict RRAS exposure by limiting inbound network access to trusted IP ranges and VPN endpoints only. 3. Disable or restrict RRAS services on systems where it is not essential to reduce the attack surface. 4. Implement strict firewall rules to block unsolicited traffic to RRAS ports, especially from untrusted networks. 5. Employ multi-factor authentication (MFA) and strong endpoint security controls to mitigate the risk of user interaction-based exploitation. 6. Monitor network traffic for anomalous patterns indicative of exploitation attempts targeting RRAS. 7. Conduct user awareness training to reduce the likelihood of user actions that could trigger the vulnerability. 8. Consider upgrading affected systems to a supported Windows version with active security updates to eliminate exposure to legacy vulnerabilities.