CVE-2025-21549 is a high-severity vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware. The supported version affected is 14.1.1.0.0. This vulnerability allows unauthenticated attackers with network access via HTTP/2 to compromise Oracle WebLogic Server. Successful exploitation can lead to an unauthorized ability to cause a hang or frequently repeatable crash, resulting in a complete denial of service (DOS) of the affected server.
The CVSS 3.1 base score for this vulnerability is 7.5, indicating significant availability impacts. Attackers may leverage this vulnerability due to its low complexity and the elimination of any required privileges or user interaction. Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability.
Given the ease of exploitation and the potential for significant operational disruption, it is critical for organizations using affected versions of Oracle WebLogic Server to address this vulnerability as part of their security posture. This high-severity risk necessitates immediate attention.
The urgency for defenders is underscored by the potential for widespread impact across environments utilizing this software component. Organizations must assess their exposure and implement necessary security measures promptly.
Vulnerability Details
The vulnerability is classified under CWE-400, indicating a potential for resource exhaustion. The official description details the nature of the vulnerability and its impact on availability. The CVSS vector for this vulnerability is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating network attack vector, low attack complexity, no required privileges, and no user interaction needed.
Technical Analysis
The root cause of CVE-2025-21549 lies in the handling of HTTP/2 requests within the Oracle WebLogic Server. The attack vector is network-based, allowing attackers to send crafted requests that exploit weaknesses in the server's processing logic.
The attack complexity is classified as low, meaning that a broad range of attackers could potentially exploit this vulnerability without requiring advanced skills. Importantly, the attacker does not require any privileges to initiate an attack, nor is user interaction necessary.
The impact of a successful attack would primarily affect the availability of the service, resulting in a denial of service condition for users of the Oracle WebLogic Server.
Risk & Impact Analysis
Risk to organizations includes the potential for significant service disruptions due to denial of service attacks. The blast radius could extend to all users of the compromised WebLogic Server, potentially impacting critical business operations.
The CVSS score of 7.5 indicates a high severity level, necessitating immediate action. Given that the vulnerability is not currently listed in the Known Exploited Vulnerabilities (KEV) catalog, organizations must proactively patch to prevent any future exploits.
Organizations should assess their deployment configurations and implement remediation strategies to mitigate risks associated with this vulnerability. The urgency assessment based on CVSS underscores the importance of prioritizing remediation in security practices.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The specific affected version is 14.1.1.0.0 of the Oracle WebLogic Server. Organizations using this version must take immediate action to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching the Oracle WebLogic Server to the latest version available to address this vulnerability. If a patch is unavailable, consider implementing network controls to limit access to the affected application components.
Configuration hardening and continuous monitoring are also recommended to detect any anomalies that may indicate an ongoing attack. For further guidance, organizations can refer to our penetration testing services.
Detection Guidance
Organizations should monitor log files for unusual patterns, especially those related to HTTP/2 traffic. Behavioral anomalies, such as unusual server responses or increased error rates, should be investigated. Additionally, network signatures that identify malicious traffic targeting Oracle WebLogic Server should be established.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-21549 highlights the ongoing need for vigilance in securing web application servers. This vulnerability exemplifies the types of threats that can arise from exposed network services, particularly those that are easy to exploit.
Security teams should incorporate lessons from this incident into their strategic planning, ensuring that they remain prepared for similar vulnerabilities in the future. For comprehensive security measures, organizations can explore our application security assessment services.
Additionally, the current trends in vulnerability exposure and severity underscore the importance of proactive security measures. Organizations can gain further insights from our 2025 vulnerability exposure severity trends report.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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