CVE-2025-30699 is a vulnerability identified in Oracle MySQL Server's Stored Procedure component affecting multiple supported versions, including 8.0.0 to 8.0.41, 8.4.0 to 8.4.4, and 9.0.0 to 9.2.0. The flaw allows an attacker with high privileges and network access through multiple protocols to exploit the vulnerability to cause the MySQL Server to hang or crash repeatedly, resulting in a complete denial of service (DoS). The vulnerability does not allow for unauthorized data disclosure or modification but impacts the availability of the database service. The CVSS 3.1 base score is 4.9, with vector AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, indicating network attack vector, low attack complexity, required high privileges, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact. The vulnerability is categorized under CWE-284 (Improper Access Control), highlighting that the issue arises due to insufficient access control mechanisms in the stored procedure handling. No patches or exploit code are currently publicly available, and no known active exploitation has been reported. However, the vulnerability is easily exploitable by an attacker who already has elevated privileges and network access, making it a significant risk for environments where such access is possible. The presence of multiple protocols for network access increases the attack surface. This vulnerability underscores the importance of strict privilege management and network segmentation for MySQL servers.

For European organizations, the primary impact of CVE-2025-30699 is the potential for denial of service against MySQL database servers, which can disrupt critical business applications and services relying on these databases. This can lead to operational downtime, loss of productivity, and potential financial losses, especially in sectors such as finance, telecommunications, healthcare, and e-commerce where database availability is crucial. Although the vulnerability does not compromise data confidentiality or integrity, the availability impact can affect service level agreements (SLAs) and damage organizational reputation. Organizations with complex distributed architectures or cloud deployments using affected MySQL versions are at increased risk if network access controls and privilege restrictions are not properly enforced. The requirement for high privileges limits the threat to insiders or attackers who have already compromised administrative credentials, but the ease of exploitation once such access is obtained makes it a significant concern for internal security posture. Additionally, the multi-protocol access vector means that multiple network entry points must be secured to prevent exploitation.

1. Apply security patches from Oracle as soon as they become available to address CVE-2025-30699. 2. Restrict network access to MySQL servers by implementing strict firewall rules and network segmentation, allowing only trusted hosts and management systems to connect. 3. Enforce the principle of least privilege by auditing and minimizing high-privilege accounts and roles within MySQL to reduce the risk of privilege abuse. 4. Monitor MySQL server logs and network traffic for unusual activity or repeated crashes that could indicate exploitation attempts. 5. Disable or restrict stored procedure execution privileges to only necessary users and roles to limit the attack surface. 6. Implement multi-factor authentication (MFA) for administrative access to MySQL servers to reduce the risk of credential compromise. 7. Regularly review and update access control policies and conduct internal security assessments to detect privilege escalation risks. 8. Consider deploying database activity monitoring (DAM) solutions to detect and alert on anomalous stored procedure calls or denial of service patterns. 9. Maintain up-to-date backups and disaster recovery plans to ensure rapid restoration in case of service disruption. 10. Educate internal teams about the risks associated with high-privilege access and enforce strict operational security practices.