CVE-2024-30008 is a medium-severity vulnerability identified in the Microsoft Windows 10 Version 1809 operating system, specifically affecting the Desktop Window Manager (DWM) Core Library. The vulnerability is classified under CWE-191, which pertains to integer underflow (wrap or wraparound) issues. An integer underflow occurs when an arithmetic operation attempts to reduce a numeric value below its minimum representable value, causing it to wrap around to a very large number or an unexpected value. In this case, the flaw in the DWM Core Library can lead to an information disclosure vulnerability. The vulnerability requires local access with low privileges (AV:L, PR:L) and does not require user interaction (UI:N). The attacker can exploit this flaw to gain unauthorized access to sensitive information from the affected system. The CVSS v3.1 base score is 5.5, indicating a medium severity level, with a high impact on confidentiality (C:H), but no impact on integrity or availability (I:N, A:N). The vulnerability scope is unchanged (S:U), meaning the exploit affects only the vulnerable component and does not extend to other system components. Exploitation complexity is low (AC:L), and the exploit is currently not known to be used in the wild. No patches or mitigations have been explicitly linked yet, but given the nature of the vulnerability, it is likely that Microsoft will release a security update addressing this issue. The vulnerability affects Windows 10 Version 1809 (build 10.0.17763.0), which is an older version of Windows 10, so systems running this version remain at risk until updated or patched.

For European organizations, this vulnerability poses a risk primarily to confidentiality, as it allows potential unauthorized disclosure of sensitive information from affected Windows 10 Version 1809 systems. Organizations that still operate legacy systems or have not updated their Windows 10 installations are particularly vulnerable. The impact could be significant in environments where sensitive data is processed or stored on affected machines, such as government agencies, financial institutions, healthcare providers, and critical infrastructure operators. Since the vulnerability requires local access with low privileges, it could be exploited by malicious insiders or attackers who have gained limited foothold within a network. Although it does not affect system integrity or availability, the information disclosure could facilitate further attacks, such as privilege escalation or lateral movement within a network. The lack of known exploits in the wild reduces immediate risk, but the presence of a known vulnerability in a widely used OS version means that attackers may develop exploits in the future, especially targeting unpatched systems in environments with high-value data.

1. Immediate mitigation should focus on upgrading affected systems from Windows 10 Version 1809 to a more recent, supported version of Windows 10 or Windows 11, as this will eliminate the vulnerable code path. 2. If upgrading is not immediately feasible, organizations should implement strict access controls to limit local access to affected machines, ensuring that only trusted users with a legitimate need can log in. 3. Employ endpoint detection and response (EDR) solutions to monitor for unusual local activity that could indicate attempts to exploit this vulnerability. 4. Regularly audit and restrict the use of accounts with local privileges to minimize the attack surface. 5. Monitor official Microsoft security advisories closely for the release of patches addressing CVE-2024-30008 and apply them promptly once available. 6. Conduct internal vulnerability assessments to identify systems still running Windows 10 Version 1809 and prioritize their remediation. 7. Implement network segmentation to contain potential lateral movement if an attacker exploits this vulnerability. 8. Educate users about the risks of local privilege misuse and enforce strong endpoint security policies.