CVE-2025-64740 is a vulnerability classified under CWE-347, indicating improper verification of cryptographic signatures in the Zoom Workplace VDI Client installer for Windows. The flaw arises because the installer does not correctly validate the cryptographic signature of components during installation, allowing an authenticated local user to bypass security controls. This improper verification can be exploited to escalate privileges on the affected system, potentially granting administrative rights to a user with initially limited access. The vulnerability requires local access and some user interaction, with a high attack complexity, as indicated by the CVSS vector (AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially compromised component. The impact on confidentiality, integrity, and availability is high, as an attacker could gain full control over the system. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk due to the widespread use of Zoom Workplace VDI Client in enterprise environments. The lack of published patches at the time of disclosure necessitates immediate attention to mitigate potential exploitation. Organizations should monitor vendor communications for updates and prepare to deploy fixes promptly.

For European organizations, this vulnerability could lead to severe security breaches, especially in environments relying on Zoom Workplace VDI Client for remote work and virtual desktop infrastructure. Successful exploitation allows attackers to escalate privileges locally, potentially leading to unauthorized access to sensitive corporate data, disruption of services, and lateral movement within networks. The high confidentiality, integrity, and availability impact means that critical business operations could be compromised. Given the increasing reliance on VDI solutions in Europe due to remote work trends, this vulnerability could affect sectors such as finance, healthcare, government, and technology. The risk is amplified in organizations with less stringent local user access controls or where endpoint security monitoring is insufficient. Additionally, the vulnerability could undermine trust in virtual collaboration tools, impacting productivity and compliance with data protection regulations like GDPR.

1. Monitor Zoom Communications Inc. for official patches addressing CVE-2025-64740 and apply them immediately upon release. 2. Restrict local user permissions rigorously to minimize the number of users with authenticated local access capable of exploiting the vulnerability. 3. Implement application whitelisting and integrity monitoring to detect unauthorized modifications to the Zoom Workplace VDI Client installer or related components. 4. Employ endpoint detection and response (EDR) solutions to identify suspicious privilege escalation attempts and anomalous installer behavior. 5. Conduct regular audits of local user accounts and remove or disable unnecessary accounts to reduce attack surface. 6. Educate users about the risks of interacting with untrusted installers or software components, emphasizing the need for caution even with authenticated access. 7. Use network segmentation to limit the impact of a compromised endpoint and prevent lateral movement. 8. Prepare incident response plans specifically addressing local privilege escalation scenarios within VDI environments.