CVE-2024-21239VulnerabilityPublished 15 Oct 2024Updated 3 Nov 2025

CVE-2024-21239: Oracle MySQL Server · Easily exploitable vulnerability allows high privileged attacker with network access via multiple

Affects Oracle MySQL ServerSource CVE Database V5

Not known to be exploited · CVSS 4.9 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

4.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 1.0% chance of exploitation in 30 days – higher than 63% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Oct 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Mysqlmysql/mysql-server`pkg:deb/mysql/mysql-server`Other threats	Affected <=8.0.39 <=8.4.2 <=9.0.1	Fixed in–

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AI-suggested

1. Monitor Oracle's official security advisories and apply patches promptly once they are released for the affected MySQL versions. 2. Restrict network access to MySQL servers by implementing strict firewall rules, allowing only trusted hosts and necessary protocols to connect. 3. Enforce the principle of least privilege by ensuring that database users and administrators have only the permissions necessary for their roles, reducing the risk of high privilege exploitation. 4. Implement network segmentation to isolate MySQL servers from less trusted network zones and limit exposure to potential attackers. 5. Regularly audit and monitor MySQL server logs and system behavior to detect unusual activity or repeated crashes indicative of exploitation attempts. 6. Use intrusion detection and prevention systems (IDS/IPS) to identify and block suspicious traffic targeting MySQL protocols. 7. Employ multi-factor authentication (MFA) and strong credential management for administrative accounts to reduce the risk of privilege escalation. 8. Consider deploying high availability and failover mechanisms to minimize downtime in case of service disruption. 9. Conduct internal security assessments and penetration tests focusing on privilege escalation and network access controls related to MySQL servers. 10. Educate internal teams about the risks of privilege misuse and the importance of timely patching and monitoring.

Description

Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.39 and prior, 8.4.2 and prior and 9.0.1 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).

Impact

For European organizations, the primary impact of CVE-2024-21239 is the potential for denial-of-service attacks against MySQL Server instances, leading to service outages and operational disruptions. Organizations using MySQL for critical applications such as financial transactions, e-commerce, government services, or healthcare data management could experience downtime, affecting business continuity and service availability. The vulnerability does not expose data to theft or modification but can degrade trust and cause financial losses due to interrupted services. In sectors with strict uptime requirements and regulatory compliance (e.g., GDPR mandates on data availability and integrity), repeated outages could lead to compliance issues and reputational damage. Since exploitation requires high privileges, the threat is more relevant to insider threats or attackers who have already compromised internal systems. European organizations with large MySQL deployments or those exposed to multiple network protocols for database access are at higher risk. The lack of known exploits in the wild reduces immediate threat but does not eliminate the risk of future exploitation, especially if attackers develop tools to leverage this vulnerability. The impact is thus medium but significant for critical infrastructure and services relying on MySQL.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Nov 2025, 23:51 UTC

Technical details

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