CVE-2025-53045 is a vulnerability identified in the InnoDB component of Oracle MySQL Server affecting multiple supported versions including 8.0.0 to 8.0.43, 8.4.0 to 8.4.6, and 9.0.0 to 9.4.0. The flaw allows an attacker with high privileges and network access via multiple protocols to cause the MySQL Server to hang or crash repeatedly, resulting in a denial-of-service condition. The vulnerability is classified under CWE-400, indicating a resource exhaustion issue. The attack vector is network-based (AV:N), with low attack complexity (AC:L), requiring high privileges (PR:H), no user interaction (UI:N), and impacts availability (A:H) without compromising confidentiality or integrity. This means that while an attacker must already have elevated access, they can disrupt database availability remotely, potentially affecting dependent applications and services. No patches were linked at the time of publication, and no known exploits have been reported in the wild, but the vulnerability is easily exploitable given the low complexity and network accessibility. The vulnerability’s impact is limited to availability, causing service outages rather than data breaches or corruption. Organizations using affected MySQL versions should prioritize monitoring and prepare to apply patches once released by Oracle.

For European organizations, this vulnerability poses a risk primarily to the availability of critical database services running MySQL Server. Enterprises relying on MySQL for transactional systems, web applications, or internal data processing could face service disruptions if an attacker with high privileges exploits this flaw. This could lead to downtime, loss of productivity, and potential financial losses, especially in sectors such as finance, telecommunications, and e-commerce where database availability is crucial. Since exploitation requires high privileges, the threat is more significant if internal systems are compromised or if privileged credentials are leaked. The lack of confidentiality or integrity impact reduces the risk of data theft or manipulation, but availability attacks can still cause reputational damage and operational challenges. European organizations with exposed MySQL servers or insufficient network segmentation are at higher risk. The absence of known exploits currently provides a window for proactive mitigation.

1. Monitor Oracle’s security advisories closely and apply official patches immediately upon release to address this vulnerability. 2. Restrict network access to MySQL Server instances using firewalls and network segmentation to limit exposure only to trusted hosts and services. 3. Enforce strict access controls and privilege management to minimize the number of users with high privileges capable of exploiting this vulnerability. 4. Implement intrusion detection and prevention systems (IDS/IPS) to detect unusual traffic patterns or repeated connection attempts that may indicate exploitation attempts. 5. Regularly audit MySQL user privileges and remove unnecessary elevated permissions. 6. Employ database connection proxies or gateways that can provide an additional layer of filtering and monitoring. 7. Maintain robust backup and recovery procedures to quickly restore service in case of a denial-of-service incident. 8. Conduct internal penetration testing and vulnerability assessments focusing on MySQL Server configurations and access controls to identify potential attack vectors.