Overview
CVE-2025-30669 is a security vulnerability affecting certain Zoom Clients. Discovered and published on November 13, 2025, this flaw stems from improper certificate validation, potentially allowing an unauthenticated attacker with adjacent network access to conduct information disclosure. The severity is rated as MEDIUM, with a CVSS score of 4.8.
Technical Details
The vulnerability lies in how specific versions of the Zoom Client handle certificate validation. Due to insufficient checks, an attacker positioned on the same network (adjacent access) could potentially exploit this weakness to intercept or manipulate network traffic, leading to the disclosure of sensitive information. This is possible because the Zoom client may not properly verify the authenticity or integrity of the certificates presented to it during communication establishment. The specific details of the vulnerable Zoom Client versions affected are outlined in the official Zoom Security Bulletin (referenced below).
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) score for CVE-2025-30669 is 4.8, indicating a MEDIUM severity. This score reflects the following characteristics:
- Attack Vector (AV): A (Adjacent) – The attacker needs to be on the same physical or logical network segment.
- Attack Complexity (AC): H (High) – Exploitation requires specialized access conditions or circumstances.
- Privileges Required (PR): N (None) – No privileges are required to perform the attack.
- User Interaction (UI): N (None) – No user interaction is required to trigger the vulnerability.
- Scope (S): U (Unchanged) – The vulnerability’s impact is limited to the affected component.
- Confidentiality Impact (C): L (Low) – There is limited information disclosure.
- Integrity Impact (I): N (None) – There is no impact to data integrity.
- Availability Impact (A): N (None) – There is no impact to system availability.
Possible Impact
Successful exploitation of CVE-2025-30669 could lead to the following consequences:
- Information Disclosure: An attacker could potentially intercept and view sensitive information transmitted through the Zoom Client, such as meeting details, participant lists, or even snippets of conversation. The scope of the information disclosed depends on the specific data transmitted during the vulnerable connection.
- Compromised Confidentiality: Although the CVSS score indicates a Low Confidentiality Impact, any disclosure of information can compromise the confidentiality of communications and potentially lead to further security breaches if the leaked data is valuable.
Mitigation and Patch Steps
To mitigate the risk posed by CVE-2025-30669, it is strongly recommended to take the following steps:
- Update Zoom Client: Immediately update your Zoom Client to the latest version. Zoom has released a patch to address this vulnerability.
- Verify Update: Ensure the update is successfully installed by checking the Zoom Client version number. Consult the Zoom documentation for instructions on how to verify the version.
- Network Security: Implement network segmentation and access controls to minimize the risk of adjacent network access for potential attackers.
- Monitor Network Traffic: Monitor network traffic for suspicious activity that might indicate exploitation attempts.