CVE-2026-21975 is a medium-severity vulnerability affecting the Java VM component of Oracle Database Server. This vulnerability impacts supported versions 19.3-19.29 and 21.3-21.20. It allows a high privileged attacker with Authenticated User privileges and network access via Oracle Net to compromise the Java VM.
Successful exploitation requires human interaction from a person other than the attacker, leading to unauthorized capabilities that can cause a hang or a frequently repeatable crash of the Java VM, resulting in a complete denial of service (DoS). The CVSS 3.1 base score for this vulnerability is 4.5, indicating significant availability impacts.
Organizations that rely on the affected versions should take immediate action. The vulnerability does not currently have a public exploit confirmed, but the potential for denial of service necessitates a proactive approach to security.
Given the nature of the vulnerability and the impact it can have, organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability in question is described as follows: Vulnerability in the Java VM component of Oracle Database Server.
The CVSS score is 4.5, indicating a medium severity. The attack vector is network-based, with a low attack complexity. Attackers require high privileges and user interaction to exploit this vulnerability. The impacts on confidentiality and integrity are none, while the availability impact is high.
The affected products include the Java Virtual Machine, specifically versions 19.3-19.29 and 21.3-21.20. The vulnerability was published on January 20, 2026.
Technical Analysis
The root cause of CVE-2026-21975 is a flaw within the Java VM component that allows an attacker with authenticated privileges to manipulate the environment, leading to a denial of service. The attack vector is network-based, meaning that an attacker can exploit the vulnerability remotely.
The attack complexity is classified as low, and attackers require high privileges to execute the exploit. Additionally, user interaction is required, which adds a layer of complexity to the exploitation process.
The confidentiality and integrity impacts of this vulnerability are rated as none, but the availability impact is high, posing significant risks to operational continuity.
Risk & Impact Analysis
The real-world deployment of CVE-2026-21975 carries considerable risk for organizations using the affected versions of Oracle Database Server. The potential for a denial of service due to this vulnerability can lead to significant downtime and operational disruption.
With the vulnerability being easily exploitable, organizations must be aware of the blast radius. The requirement for human interaction may limit the likelihood of exploitation, but it does not eliminate the threat. The urgency for organizations to patch this vulnerability is high, given the potential impacts.
Organizations should prioritize patching immediately to mitigate these risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the Oracle Java Virtual Machine are 19.3-19.29 and 21.3-21.20. Organizations should be aware that all versions prior to the vendor patch are considered vulnerable.
Mitigation & Remediation
Organizations should apply the latest security patches provided by Oracle to remediate this vulnerability. If a patch is not available, organizations should consider implementing workarounds such as restricting network access to the Java VM component.
Configuration hardening is also recommended to minimize exposure. Furthermore, organizations should implement network controls to limit access to the affected systems and monitor for any unusual activity that may indicate attempts to exploit this vulnerability.
For continuous testing of security measures, organizations may consider using continuous penetration testing to validate the effectiveness of their security posture.
Detection Guidance
Organizations should monitor logs for indicators of potential exploitation attempts, including unusual Java VM behavior or unauthorized access attempts. Behavioral anomalies in network traffic may also provide clues to attempts to exploit this vulnerability.
Additionally, system changes that are not aligned with normal operational patterns should be investigated to identify any potential exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-21975 lies in its illustration of the ongoing risks associated with Java-based applications. This vulnerability represents a pattern of availability-based exploits that can disrupt critical services.
Security teams should take this opportunity to evaluate their incident response capabilities and ensure that their systems are resilient against similar attacks in the future.
Organizations looking to enhance their security strategies should consider adopting a comprehensive approach that includes penetration testing methodology as part of their overall security framework.
Lastly, organizations should remain vigilant about emerging threats and continuously update their security measures to adapt to new vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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