CVE-2024-21069 in MySQL Server
Summary
by MITRE • 04/17/2024
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DDL). Supported versions that are affected are 8.0.36 and prior and 8.3.0 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
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Analysis
by VulDB Data Team • 09/06/2025
This vulnerability resides within the MySQL Server's Data Definition Language implementation, specifically affecting the server component responsible for processing database schema modifications. The flaw manifests in versions 8.0.36 and earlier, as well as 8.3.0 and prior, indicating a regression or persistent issue that spans multiple release branches. The vulnerability requires a high-privileged attacker with network access through multiple protocols to exploit, suggesting that the attack vector is accessible over the network rather than requiring physical access or local system privileges. The CVSS score of 4.9 reflects a moderate to high severity threat with availability impacts, specifically targeting the server's ability to maintain operational stability.
The technical nature of this vulnerability involves a flaw in how the MySQL Server processes certain Data Definition Language operations, leading to potential denial of service conditions. When successfully exploited, the vulnerability enables an attacker to cause either a complete hang or frequent crashes of the MySQL Server instance, effectively rendering the database service unavailable to legitimate users. This type of vulnerability falls under the category of availability-focused attacks that can severely impact database operations and business continuity. The attack requires network access, indicating that the vulnerability exists in network-facing components of the server that handle incoming requests for schema modifications.
The operational impact of this vulnerability extends beyond simple service disruption, as database servers form the foundation of most enterprise applications and data management systems. A successful attack can result in complete service outages that may affect multiple applications dependent on the affected MySQL instance, potentially causing cascading failures throughout interconnected systems. The vulnerability's exploitability is rated as easily accessible, meaning that sophisticated attack techniques are not required, making it particularly dangerous for environments where database servers are exposed to untrusted networks. Organizations running affected versions of MySQL Server face significant risk of operational disruption and potential data access interruptions.
Mitigation strategies should focus on immediate patching of affected MySQL Server versions to the latest releases that contain fixes for this vulnerability. Organizations should also implement network segmentation to limit access to MySQL server instances, ensuring that only authorized network segments can reach database ports. Additional protective measures include monitoring for unusual network traffic patterns that might indicate exploitation attempts, implementing robust access controls with least privilege principles, and maintaining regular backups to ensure quick recovery capabilities. The vulnerability's classification under CWE categories related to input validation and resource management indicates that proper sanitization of schema modification requests is critical for preventing exploitation. Security teams should also consider implementing intrusion detection systems to monitor for potential exploitation attempts targeting this specific vulnerability, as the availability impact makes it a prime target for attackers seeking to disrupt database services.