CVE-2025-52434 is a high-severity vulnerability affecting Apache Tomcat, specifically related to concurrent execution using shared resources with improper synchronization, commonly known as a 'race condition'. This vulnerability is particularly evident when clients initiate closures of HTTP/2 connections. It impacts Apache Tomcat versions from 9.0.0.M1 through 9.0.106, along with certain end-of-life (EOL) versions ranging from 8.5.0 to 8.5.100.
Given the severity of this issue, organizations that utilize Apache Tomcat must understand the implications of this vulnerability. The CVSS score for this vulnerability is 7.5, indicating that it poses a significant risk due to its potential for denial of service (DoS) attacks. The vulnerability allows attackers to disrupt service availability, making it critical for defenders to act promptly.
Organizations should prioritize patching immediately, as the recommended version to mitigate this vulnerability is 9.0.107. Failure to address this vulnerability can have severe consequences for operational continuity and security.
Currently, there are no known public exploits or proof of concept (PoC) available for this vulnerability, but given its nature, monitoring and readiness for potential exploitation should be a priority.
Vulnerability Details
The official description of CVE-2025-52434 indicates a vulnerability in Apache Tomcat associated with concurrent execution using shared resources with improper synchronization. The attack vector for this vulnerability is over a network, and it has a low attack complexity. No privileges are required for exploitation, and user interaction is not necessary. The vulnerability results in a high impact on availability while having no effects on confidentiality or integrity.
Technical Analysis
The root cause of this vulnerability lies in the improper synchronization mechanism employed by Apache Tomcat when handling concurrent client requests. This flaw in the APR/Native connector is particularly evident during HTTP/2 connection closures initiated by the client. If exploited, attackers could potentially cause a denial of service by overwhelming the server with concurrent requests.
The attack vector is classified as a network, and the complexity of the attack is deemed low. No privileges or user interaction are required to exploit this vulnerability, making it particularly concerning. The availability impact is rated high, meaning that the vulnerability could lead to significant disruptions in service.
Risk & Impact Analysis
Risk to organizations includes potential service disruption, which can result in loss of availability. Given the high CVSS score of 7.5, there is an urgent need for organizations to address this vulnerability. The blast radius could affect all instances of Apache Tomcat in use, particularly those configured with the vulnerable versions. Organizations should prepare for the possibility of increased scrutiny from stakeholders and customers regarding their security practices.
Organizations should address this vulnerability in priority patch cycles, ensuring that all affected systems are updated to version 9.0.107 or later. Given that the vulnerability affects EOL versions as well, organizations using these older versions must also take immediate action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Apache Tomcat are affected by CVE-2025-52434: from 9.0.0.M1 through 9.0.106, as well as EOL versions from 8.5.0 through 8.5.100. Organizations running these versions should upgrade to version 9.0.107 or later.
Mitigation & Remediation
To remediate this vulnerability, users are strongly advised to upgrade to version 9.0.107 of Apache Tomcat. If immediate upgrades are not feasible, consider implementing network controls to limit access to affected services. Organizational security policies should also include monitoring for unusual traffic patterns that could indicate attempts to exploit this vulnerability.
Organizations can validate remediation efforts through penetration testing to ensure that the vulnerability has been effectively addressed.
Detection Guidance
Monitor logs for indicators of abnormal HTTP/2 connection terminations or unusual patterns in connection management. Behavioral anomalies could signal attempts to exploit the race condition vulnerability. Network signatures related to the APR/Native connector should also be examined closely.
AppSecure Threat Intelligence Insight
CVE-2025-52434 represents a significant risk for organizations using Apache Tomcat, particularly in environments where HTTP/2 connections are prevalent. The absence of known exploits does not mitigate the urgency for remediation, as vulnerabilities are often discovered post-disclosure.
Organizations should consider implementing a comprehensive vulnerability management program to proactively address potential flaws in their systems.
Furthermore, organizations should regularly engage in penetration testing to uncover similar vulnerabilities before they can be exploited.
Finally, as the landscape of security threats evolves, organizations must also stay informed of the latest trends in vulnerabilities and exploits. Engaging with vulnerability exposure severity trends can provide valuable insights into areas requiring attention.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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