CVE-2016-3405 in Zimbra Collaboration
Summary
by MITRE
Multiple unspecified vulnerabilities in Zimbra Collaboration before 8.7.0 allow remote attackers to affect integrity via unknown vectors, aka bugs 103961 and 104828.
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Analysis
by VulDB Data Team • 05/13/2026
The vulnerability identified as CVE-2016-3405 affects Zimbra Collaboration software versions prior to 8.7.0, representing a critical security flaw that exposes organizations to potential data integrity compromises. This vulnerability is categorized under multiple unspecified issues within the Zimbra platform, specifically referenced as bugs 103961 and 104828, indicating the complexity and interconnected nature of the security weaknesses present in the email and collaboration server software. The affected system represents a foundational component for enterprise communication infrastructure, making this vulnerability particularly concerning for organizations relying on Zimbra for their email and collaboration services.
The technical nature of this vulnerability stems from unspecified attack vectors that allow remote adversaries to manipulate data integrity within the Zimbra environment. While the exact technical mechanisms remain unspecified in the CVE description, such vulnerabilities typically arise from insufficient input validation, improper access controls, or flawed data processing routines within the collaboration platform. The unspecified nature suggests that the vulnerability may encompass multiple attack surfaces within the Zimbra ecosystem, potentially affecting various components including email processing, calendar functions, or contact management features. These issues fall under the broader category of integrity violations where attackers can modify or corrupt data without proper authorization, potentially leading to unauthorized changes in user information, email content, or system configurations.
The operational impact of CVE-2016-3405 extends beyond simple data corruption, as it creates opportunities for adversaries to compromise the trustworthiness of the collaboration platform. Organizations utilizing affected Zimbra versions face significant risks including unauthorized modification of email content, manipulation of calendar entries, or alteration of user account information. The remote nature of these attacks means that threat actors can exploit the vulnerability from outside the network perimeter, potentially leading to data breaches, information tampering, or disruption of business communication processes. This vulnerability directly impacts the principle of data integrity, which is fundamental to maintaining trust in enterprise communication systems and can result in compliance violations for organizations subject to regulatory requirements.
Organizations should prioritize immediate remediation through the upgrade to Zimbra Collaboration 8.7.0 or later versions to address this vulnerability. The mitigation strategy should include comprehensive testing of the updated environment to ensure compatibility with existing workflows and configurations. Security teams should conduct thorough vulnerability assessments to identify potential exploitation attempts and monitor network traffic for suspicious activities. Additionally, implementing network segmentation and access controls can provide additional defense-in-depth measures while the upgrade process is underway. This vulnerability aligns with common attack patterns documented in the MITRE ATT&CK framework under data integrity compromises, specifically relating to techniques that involve modifying or corrupting data to achieve unauthorized system access or information manipulation. Organizations should also consider implementing intrusion detection systems and continuous monitoring solutions to detect potential exploitation attempts and maintain compliance with industry standards such as those outlined in the CWE catalog for data integrity vulnerabilities.