CVE-2017-3318 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Error Handling). Supported versions that are affected are 5.5.53 and earlier, 5.6.34 and earlier and 5.7.16 and earlier. Difficult to exploit vulnerability allows high privileged attacker with logon to the infrastructure where MySQL Server executes to compromise MySQL Server. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all MySQL Server accessible data. CVSS v3.0 Base Score 4.0 (Confidentiality impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2017-3318 resides within the MySQL Server component of Oracle MySQL, specifically within the Server: Error Handling subcomponent. This flaw affects multiple version ranges including 5.5.53 and earlier, 5.6.34 and earlier, and 5.7.16 and earlier versions, representing a significant portion of the MySQL ecosystem that was prevalent during the affected period. The vulnerability classification as difficult to exploit indicates that while the attack vector is not trivial, it remains a serious concern for database security. The attack requires an attacker with high privileges who already possesses logon access to the infrastructure where MySQL Server operates, suggesting that the threat model involves internal attackers or compromised accounts with elevated permissions rather than external adversaries.
The technical nature of this vulnerability stems from improper error handling mechanisms within the MySQL Server implementation, which creates conditions where an attacker with sufficient privileges can manipulate the server's error reporting behavior to gain unauthorized access to database content. This weakness falls under the broader category of improper error handling vulnerabilities that can lead to information disclosure or privilege escalation scenarios. The CVSS v3.0 base score of 4.0 reflects the confidentiality impact, indicating that successful exploitation could result in unauthorized access to critical data or complete access to all data accessible through the MySQL Server. The requirement for human interaction from a person other than the attacker suggests that the vulnerability may involve some form of social engineering or collaborative attack vector where additional user actions are necessary to complete the exploitation process.
The operational impact of this vulnerability extends beyond simple data access, as it represents a potential pathway for attackers to compromise entire database environments. When an attacker can leverage error handling flaws to access critical data, they gain the ability to extract sensitive information that could include personal data, financial records, intellectual property, or other confidential information stored within the MySQL database. The requirement for high privileged access indicates that this vulnerability does not represent a straightforward path to database compromise, but rather exploits the trust relationship that exists between legitimate users and the database system. Organizations running affected MySQL versions face significant risk if their database environments are not properly secured at the infrastructure level, as this vulnerability could be used to bypass normal access controls and gain unauthorized data access.
Mitigation strategies for CVE-2017-3318 should focus on immediate version upgrades to patched releases of MySQL Server, as well as implementing comprehensive access controls and monitoring mechanisms. Organizations should ensure that only necessary users have elevated privileges and that all database access is properly audited and logged. The vulnerability's classification aligns with CWE-248, which addresses "Exception Handling" weaknesses, and may relate to ATT&CK techniques involving privilege escalation and credential access. Security teams should implement network segmentation to limit access to MySQL servers, deploy intrusion detection systems to monitor for unusual error handling patterns, and conduct regular security assessments to identify potential exploitation vectors. Additionally, maintaining current patch management processes and establishing robust incident response procedures will help organizations quickly address any potential exploitation attempts and minimize the impact of similar vulnerabilities in the future.