CVE-2025-41239 is classified as a high-severity vulnerability impacting VMware ESXi, Workstation, Fusion, and VMware Tools. This vulnerability allows information disclosure due to the usage of uninitialized memory in vSockets. A malicious actor with local administrative privileges on a virtual machine may be able to exploit this issue to leak sensitive memory from processes communicating with vSockets.
The CVSS score for this vulnerability is 7.1, indicating a high severity level. The attack vector for this vulnerability is local, and it requires low attack complexity. While the vulnerability does not require user interaction, it does have a significant impact on confidentiality, with a high confidentiality impact score.
Risk to organizations includes potential unauthorized access to sensitive data within virtual machines. As this vulnerability is categorized as high risk, organizations should prioritize patching immediately to prevent exploitation.
As of now, there are no known exploits associated with this vulnerability, and it has not been confirmed to be actively exploited in the wild. However, organizations should remain vigilant and monitor for any updates or changes to the exploitation status.
Vulnerability Details
VMware ESXi, Workstation, Fusion, and VMware Tools present an information disclosure vulnerability due to the usage of uninitialized memory in vSockets. Affected systems include all versions prior to the vendor's patch. The vulnerability was published on July 15, 2025, and is classified under CWE-908.
Technical Analysis
The root cause of this vulnerability stems from the use of uninitialized memory within the vSockets communication layer. Attackers with local administrative privileges can exploit this flaw to access sensitive data stored in memory.
The attack vector is local, meaning that an attacker must have access to the vulnerable virtual machine. The attack complexity is low, indicating that exploitation can be achieved without significant technical hurdles. No user interaction is required for exploitation, making it easier for attackers to leverage this vulnerability.
The impact of this vulnerability is primarily on confidentiality, as it allows unauthorized access to potentially sensitive information. There are no integrity or availability impacts associated with this vulnerability.
Risk & Impact Analysis
The real-world risk associated with CVE-2025-41239 involves the potential for attackers to access sensitive data from virtual machines, which could lead to further attacks or data breaches. The blast radius for this vulnerability may include any organization that utilizes the affected VMware products, particularly those that do not enforce strict access controls.
Given the high CVSS score of 7.1, organizations should address this vulnerability in their priority patch cycle. The urgency for remediation is critical as the potential for exploitation is significant, particularly in environments where local administrative access is granted.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected by this vulnerability. It is crucial for organizations to verify their VMware installations and ensure they are updated.
Mitigation & Remediation
Organizations must apply the latest patches provided by VMware to mitigate this vulnerability. In the absence of a patch, consider implementing strict access controls and monitoring for unusual activity on virtual machines. Configuration hardening and network segmentation can also help reduce exposure.
Detection Guidance
Monitor logs for unusual memory access patterns and any unauthorized attempts to access vSockets. Behavioral anomalies in virtual machine performance may also indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-41239 reflects the growing concern over information disclosure vulnerabilities in virtualization environments. Security teams should prioritize vulnerability management programs and conduct regular assessments to identify and remediate such risks.
Organizations may benefit from implementing continuous penetration testing to identify weaknesses in their security posture. For more insights on effective security strategies, consider reviewing our penetration testing services and how they can enhance overall security measures.
Additionally, organizations should stay informed on the latest trends and patterns in vulnerability exploitation. Reviewing our 2025 vulnerability exposure severity trends can provide valuable insights into emerging threats and necessary defensive measures.
Finally, leveraging comprehensive security frameworks, such as those outlined in our application security program guide, can assist organizations in developing a resilient security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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