CVE-2025-30704 is a vulnerability identified in Oracle MySQL Server affecting versions 8.0.0 to 8.0.41, 8.4.0 to 8.4.4, and 9.0.0 to 9.2.0. The flaw resides in the server's handling of certain network protocol interactions, allowing an attacker with high privileges and network access to cause the server to hang or crash repeatedly, resulting in a complete denial-of-service (DoS). The vulnerability is categorized under CWE-400, indicating it is related to uncontrolled resource consumption leading to service disruption. The CVSS 3.1 base score is 4.4, reflecting a medium severity primarily due to availability impact. The attack vector is network-based (AV:N), but the attack complexity is high (AC:H), requiring the attacker to have elevated privileges (PR:H) and no user interaction (UI:N) is needed. The scope remains unchanged (S:U), and there is no impact on confidentiality or integrity, only availability (A:H). No public exploits are known at this time, and Oracle has not yet provided patches. The vulnerability affects multiple protocols used by MySQL Server, increasing the potential attack surface for authorized users or compromised internal actors. This vulnerability could be leveraged in targeted attacks to disrupt database services, impacting dependent applications and services.

For European organizations, the primary impact of CVE-2025-30704 is service availability disruption. MySQL Server is widely used across various sectors including finance, telecommunications, government, and e-commerce in Europe. A successful exploitation could cause database downtime, leading to interruption of critical business operations, loss of productivity, and potential financial losses. Although the vulnerability does not compromise data confidentiality or integrity, the denial-of-service could affect customer-facing services and internal systems reliant on MySQL databases. Organizations with high availability requirements or those operating in regulated industries may face compliance risks if service disruptions occur. Additionally, the requirement for high privileges limits the risk to insider threats or attackers who have already gained elevated access, but this also means that compromised privileged accounts could be leveraged to exploit this vulnerability. The lack of known exploits reduces immediate risk, but the potential for targeted attacks remains, especially in environments where MySQL is exposed to internal or external networks.

1. Monitor Oracle's security advisories closely and apply patches or updates as soon as they become available to address CVE-2025-30704. 2. Restrict network access to MySQL Server instances to only trusted hosts and networks, using firewalls and network segmentation to limit exposure. 3. Enforce strict access controls and least privilege principles to minimize the number of users with high privileges capable of exploiting this vulnerability. 4. Implement robust monitoring and alerting on MySQL Server performance and availability metrics to detect unusual hangs or crashes promptly. 5. Regularly audit privileged user accounts and network access logs to identify potential misuse or compromise. 6. Consider deploying MySQL Server in high availability configurations with failover capabilities to reduce downtime impact. 7. Use network-level protections such as intrusion detection/prevention systems (IDS/IPS) to detect anomalous traffic patterns targeting MySQL protocols. 8. Conduct internal penetration testing and vulnerability assessments focusing on privilege escalation and network access controls to identify and remediate weaknesses before exploitation.