CVE-2024-30095 is a heap-based buffer overflow vulnerability (CWE-122) discovered in the Windows Routing and Remote Access Service (RRAS) component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). RRAS is a service that provides routing and VPN capabilities, often used in enterprise environments to manage network traffic and remote access. The vulnerability arises from improper handling of input data within RRAS, leading to a heap overflow condition. An attacker with local access but no privileges (PR:N) can exploit this flaw by sending crafted input that triggers the overflow, causing memory corruption. This can enable remote code execution with system-level privileges, compromising confidentiality, integrity, and availability of the affected system. The CVSS v3.1 base score is 7.8, reflecting high severity, with attack vector local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope remains unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). No known exploits have been reported in the wild yet, but the vulnerability is publicly disclosed and assigned a CVE ID. The vulnerability was reserved in March 2024 and published in June 2024. No official patch links are currently provided, indicating that mitigation may require upgrading or applying forthcoming patches. This vulnerability is particularly concerning for legacy systems still running Windows 10 Version 1809, which is out of mainstream support, increasing the risk of unpatched exposures. RRAS exposure to untrusted users or networks increases the attack surface. The vulnerability's exploitation could lead to full system compromise, data theft, or disruption of network services.

For European organizations, this vulnerability poses a significant risk, especially those relying on Windows 10 Version 1809 in their infrastructure. Enterprises using RRAS for VPN or routing services could face remote code execution attacks that compromise critical network gateways or remote access servers. This could lead to unauthorized access to sensitive data, disruption of business operations, and potential lateral movement within corporate networks. The high impact on confidentiality, integrity, and availability means attackers could steal data, alter configurations, or cause denial of service. Organizations in sectors such as finance, government, healthcare, and critical infrastructure are particularly vulnerable due to their reliance on secure remote access and network routing. The lack of known exploits currently provides a window for proactive mitigation, but the public disclosure increases the risk of future exploitation. Legacy systems and those with limited patch management capabilities are at elevated risk. The requirement for user interaction and local access somewhat limits remote exploitation but does not eliminate risk, especially in environments where RRAS is exposed or users can be socially engineered.

1. Immediately identify and inventory all systems running Windows 10 Version 1809, focusing on those with RRAS enabled. 2. Apply any available security updates or patches from Microsoft as soon as they are released. If no patch is currently available, plan to upgrade affected systems to a supported Windows version that receives security updates. 3. Restrict RRAS exposure by limiting network access to trusted users and devices only; implement strict firewall rules to block unauthorized access to RRAS services. 4. Monitor RRAS logs and network traffic for unusual or suspicious activity indicative of exploitation attempts, such as unexpected connection requests or crashes. 5. Employ endpoint detection and response (EDR) tools to detect anomalous behavior related to memory corruption or privilege escalation. 6. Educate users about the risks of interacting with untrusted content or executing unknown software, as user interaction is required for exploitation. 7. Consider disabling RRAS on systems where it is not essential to reduce the attack surface. 8. Maintain robust backup and recovery procedures to minimize impact in case of compromise. 9. Coordinate with IT and security teams to prioritize remediation of legacy systems and reduce reliance on unsupported OS versions.