CVE-2017-3258 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: DDL). Supported versions that are affected are 5.5.53 and earlier, 5.6.34 and earlier and 5.7.16 and earlier. Easily exploitable vulnerability allows low 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 v3.0 Base Score 6.5 (Availability impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2017-3258 represents a critical availability flaw within Oracle MySQL Server's Data Definition Language processing functionality. This weakness exists in the server component's handling of DDL operations and affects multiple major versions including 5.5.53 and earlier, 5.6.34 and earlier, and 5.7.16 and earlier releases. The vulnerability's classification as easily exploitable indicates that attackers with minimal privileges and network access can leverage this flaw to compromise the targeted MySQL server instances. The affected DDL processing subsystem within MySQL Server creates a pathway for malicious actors to disrupt normal service operations through carefully crafted database commands that trigger system instability.
The technical nature of this vulnerability stems from improper handling of specific DDL operations within the MySQL Server architecture, particularly in how the server processes certain data definition language statements. When an attacker executes maliciously constructed DDL commands against a vulnerable MySQL instance, the server's internal processing logic fails to properly validate or handle these inputs, leading to system resource exhaustion or memory corruption conditions. This flaw operates at the core database engine level where DDL operations are parsed, validated, and executed, making it particularly dangerous as it can be triggered through multiple network protocols including TCP/IP connections to the MySQL service port. The vulnerability's design flaw allows for a complete denial of service condition where the MySQL server becomes unresponsive or crashes repeatedly, effectively rendering the database service unavailable to legitimate users and applications.
The operational impact of CVE-2017-3258 extends beyond simple service disruption to create significant business continuity risks for organizations relying on MySQL databases. A successful exploitation can lead to complete system downtime that affects critical applications, transaction processing, and data access capabilities across enterprise environments. The vulnerability's ability to cause frequent crashes makes it particularly challenging to maintain service availability, as administrators may experience repeated outages that require manual intervention and system restarts. Organizations utilizing affected MySQL versions face potential financial losses due to extended downtime periods, increased administrative overhead for system recovery, and possible data integrity concerns during crash recovery scenarios. The low privilege requirements for exploitation mean that even users with minimal database permissions can potentially trigger this vulnerability, expanding the attack surface and increasing the likelihood of successful compromise.
Security professionals should implement immediate mitigations including applying the latest Oracle security patches and updates to affected MySQL versions, as well as implementing network-level restrictions to limit unnecessary access to MySQL service ports. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of how improper input validation can lead to system instability and denial of service conditions. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and denial of service, as attackers can leverage it to compromise system availability without requiring elevated privileges. Organizations should also consider implementing database activity monitoring to detect unusual DDL operations that might indicate exploitation attempts, while maintaining regular backup and recovery procedures to minimize impact during potential exploitation events. The CVSS v3.0 base score of 6.5 reflects the vulnerability's medium severity in terms of exploitability and impact, but the availability-focused nature of the attack makes it particularly concerning for mission-critical database environments.