CVE-2025-21523 is a medium-severity vulnerability identified in the Oracle MySQL Server product, specifically within the InnoDB component. The vulnerability impacts several versions, including 8.0.40 and prior, 8.4.3 and prior, and 9.1.0 and prior. This vulnerability allows high privileged attackers with network access via multiple protocols to compromise the MySQL Server. Successful exploitation can lead to unauthorized disruptions, including the ability to cause a hang or frequently repeatable crash, resulting in a complete denial of service (DoS) of MySQL Server.
The CVSS 3.1 base score for this vulnerability is 4.9, indicating that it has potential impacts on availability. Organizations should prioritize remediation efforts as the impact could disrupt critical database services.
Currently, there are no known exploits in the wild for this vulnerability, but its easily exploitable nature necessitates that organizations address it promptly to avoid potential service interruptions.
Organizations should prioritize patching immediately, especially those operating in environments where MySQL Server is a critical component.
Vulnerability Details
The vulnerability in MySQL Server, specifically within the InnoDB component, allows attackers with high privileges to exploit it via network access. Supported affected versions include 8.0.40 and prior, 8.4.3 and prior, and 9.1.0 and prior. The vulnerability is classified under CWE-732, indicating improper permissions management. The CVSS score of 4.9 reflects a medium severity level, emphasizing the need for organizations to implement fixes.
The publication date for this vulnerability was January 21, 2025, and it remains classified as modified, meaning additional information may become available as the situation evolves.
Technical Analysis
The root cause of CVE-2025-21523 lies in the vulnerabilities within the InnoDB component of MySQL Server. The attack vector is primarily through the network, which means that malicious actors can initiate an attack from a remote location without requiring physical access to the server. The attack complexity is low, and high privileges are required to exploit this vulnerability, which may pose a risk in environments where access controls are not strictly enforced.
No user interaction is required, making this vulnerability particularly concerning as it allows attackers to execute denial-of-service attacks without needing the target's cooperation. The impact on availability is significant, as successful exploitation can result in a complete crash of the MySQL Server, disrupting services relying on it.
Risk & Impact Analysis
The real-world risk of CVE-2025-21523 is substantial, particularly for organizations that rely on MySQL Server for critical applications. The potential for a complete denial of service means that affected organizations could face significant operational disruptions and financial losses. Furthermore, the vulnerability's medium severity level should not diminish the urgency for remediation, especially given its easily exploitable nature.
Organizations should assess their current deployment and prioritize patching or upgrading systems that run on affected versions of MySQL Server to mitigate the risks associated with this vulnerability.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of MySQL Server include: 8.0.40 and prior, 8.4.3 and prior, and 9.1.0 and prior. Organizations using these versions should plan to upgrade to the latest fixed version to mitigate vulnerabilities.
Mitigation & Remediation
Organizations should patch their MySQL Server installations to the latest version immediately. For those unable to apply the patch, implementing network controls to restrict access to the MySQL Server could help mitigate the risk. Additionally, monitoring for abnormal server behavior can aid in early detection of potential exploit attempts.
For more detailed guidance, organizations can refer to the penetration testing services offered by AppSecure.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for abnormal access patterns, server crashes, and unusual error messages. Behavioral anomalies and network signatures that indicate unauthorized access attempts should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-21523 lies in its potential to disrupt services in environments reliant on MySQL Server. Security teams should view this as a call to strengthen their defenses against similar vulnerabilities.
The vulnerability illustrates the importance of maintaining updated systems and conducting regular security assessments. Organizations can benefit from reviewing their vulnerability management program to identify and remediate weaknesses.
For comprehensive security, organizations should also consider integrating penetration testing methodology into their security posture.
Finally, organizations should engage in continuous security testing, leveraging services such as continuous penetration testing to ensure ongoing protection against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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