CVE-2016-8318 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Security: Encryption). Supported versions that are affected are 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 require human interaction from a person other than the attacker and while the vulnerability is in MySQL Server, attacks may significantly impact additional products. 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 6.8 (Availability impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2016-8318 resides within Oracle MySQL Server's encryption subsystem, specifically affecting versions 5.6.34 and earlier, as well as 5.7.16 and earlier. This flaw represents a critical availability risk that can be exploited by low-privileged attackers who gain network access through multiple protocols. The vulnerability's classification as easily exploitable indicates that attackers require minimal privileges and can leverage standard network connections to initiate attacks against the targeted MySQL server instances.
This security weakness stems from improper handling of encryption-related operations within the MySQL server architecture, creating a potential denial of service condition that can lead to complete system crashes or indefinite hangs. The technical implementation flaw allows attackers to craft specific requests that trigger memory corruption or resource exhaustion conditions within the encryption processing modules. The vulnerability's impact extends beyond just the MySQL server itself, potentially affecting related systems and applications that depend on MySQL for data storage and retrieval operations.
The operational implications of this vulnerability are severe as it enables attackers to disrupt database services through carefully constructed malicious requests that cause the MySQL server to become unresponsive or crash entirely. This creates a significant availability risk for organizations relying on MySQL databases, as successful exploitation can result in complete service outages that may last until manual intervention or system restart occurs. The requirement for human interaction from a person other than the attacker suggests that social engineering or targeted user engagement might be necessary to deliver the malicious payloads, though the underlying vulnerability remains accessible through network protocols.
From a cybersecurity perspective, this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and can be mapped to ATT&CK technique T1499.004 for network denial of service attacks. The CVSS v3.0 base score of 6.8 reflects the vulnerability's medium severity in terms of exploitability while emphasizing the significant availability impact it can cause. Organizations should prioritize immediate patching of affected MySQL versions to prevent exploitation, implement network segmentation to limit access to database servers, and establish monitoring procedures to detect unusual connection patterns or service disruptions that might indicate exploitation attempts.
Mitigation strategies should include applying the latest security patches from Oracle, implementing strict network access controls through firewalls and access control lists, and configuring MySQL server instances with reduced attack surface by disabling unnecessary protocols and services. Additionally, organizations should deploy intrusion detection systems to monitor for suspicious network traffic patterns and establish incident response procedures specifically addressing database service disruptions. Regular security assessments and vulnerability scanning should be conducted to identify unpatched systems and ensure comprehensive protection against similar encryption-related vulnerabilities that may emerge in the future.