CVE-2021-31160 in ServiceDesk Plus MSP
Summary
by MITRE • 06/29/2021
Zoho ManageEngine ServiceDesk Plus MSP before 10521 allows an attacker to access internal data.
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Analysis
by VulDB Data Team • 05/30/2025
The vulnerability CVE-2021-31160 represents a critical information disclosure flaw in Zoho ManageEngine ServiceDesk Plus MSP version 10521 and earlier. This weakness stems from inadequate access controls and authentication mechanisms within the service desk platform, which is widely used by managed service providers for IT service management. The vulnerability affects organizations that rely on this platform for handling sensitive customer data, internal IT operations, and service requests across multiple client environments.
The technical root cause of this vulnerability lies in the platform's insufficient validation of user permissions and session management. Attackers can exploit this weakness to bypass authentication mechanisms and gain unauthorized access to internal data that should be restricted to authorized personnel only. This includes sensitive information such as customer details, service requests, ticket histories, configuration data, and potentially system credentials. The flaw operates at the application layer and can be exploited through various attack vectors including web interface manipulation, API endpoint abuse, or session hijacking techniques.
The operational impact of this vulnerability is severe for organizations using ServiceDesk Plus MSP, as it creates a persistent risk of data breaches and unauthorized access to critical business information. Attackers who successfully exploit this vulnerability can access confidential data across multiple client environments, potentially leading to compliance violations, regulatory penalties, and significant financial losses. The vulnerability's impact extends beyond immediate data exposure to include potential lateral movement within networks, as compromised access could enable further attacks on connected systems. Organizations may face reputational damage and loss of client trust when such unauthorized access incidents occur, particularly in managed service provider environments where data isolation between clients is paramount.
Mitigation strategies for this vulnerability should include immediate patching to version 10521 or later, which addresses the access control weaknesses. Organizations should also implement network segmentation to limit access to the ServiceDesk Plus MSP system, enforce strict role-based access controls, and monitor for suspicious access patterns. Security controls should include regular vulnerability assessments, intrusion detection system monitoring, and comprehensive audit logging of all access attempts. The vulnerability aligns with CWE-284 (Improper Access Control) and can be mapped to ATT&CK technique T1078 (Valid Accounts) and T1046 (Network Service Scanning) as attackers may attempt to enumerate valid accounts and exploit weak access controls to gain unauthorized access to internal systems. Organizations should also consider implementing additional security measures such as multi-factor authentication, regular security training for administrators, and network access controls to reduce the attack surface and prevent exploitation of similar vulnerabilities in the future.