CVE-2025-52917 in YMCS RPS
Summary
by MITRE • 06/22/2025
The Yealink YMCS RPS API before 2025-05-26 lacks rate limiting, potentially enabling information disclosure via excessive requests.
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Analysis
by VulDB Data Team • 07/01/2025
The vulnerability identified as CVE-2025-52917 affects the Yealink YMCS RPS API version prior to the 2025-05-26 release, presenting a critical security weakness that stems from insufficient rate limiting mechanisms. This flaw allows malicious actors to exploit the system through excessive API requests, potentially leading to information disclosure and unauthorized data access. The vulnerability resides in the application layer of the Yealink YMCS platform, which is designed for unified communications and collaboration services within enterprise environments.
The technical implementation of this vulnerability demonstrates a clear failure in API request management and access control enforcement. Without proper rate limiting, the RPS API becomes susceptible to abuse through automated scripts or tools that can rapidly submit multiple requests to the system. This lack of request throttling creates a pathway for attackers to overwhelm the API endpoints and extract sensitive information through repeated access attempts. The vulnerability aligns with CWE-770, which addresses allocation of resources without proper limits or throttling, and represents a classic example of an API abuse scenario where system resources are consumed excessively to achieve unauthorized access.
The operational impact of this vulnerability extends beyond simple resource exhaustion, as it enables potential information disclosure through systematic exploitation of the API. Attackers could leverage this weakness to gather sensitive data such as user credentials, system configurations, communication logs, and other confidential information stored within the Yealink YMCS platform. The exposure of such data could compromise enterprise communication security and potentially lead to broader network infiltration attempts. This vulnerability directly impacts the confidentiality and integrity of the system as outlined in the CIA triad, and represents a significant risk to organizations relying on Yealink's unified communications services.
Organizations should implement immediate mitigations including the deployment of rate limiting mechanisms at the API gateway level, monitoring for unusual request patterns, and implementing additional authentication controls for API access. The solution approach should follow ATT&CK technique T1595.001 for network infiltration and T1071.004 for application layer protocols, as attackers may use this vulnerability to establish persistent access to communication infrastructure. System administrators should also consider implementing automated alerting for excessive API requests, deploying web application firewalls with rate limiting capabilities, and conducting regular security assessments of API endpoints. The remediation process must include updating to the patched version released on or after 2025-05-26, while maintaining comprehensive logging and monitoring of API access patterns to detect potential exploitation attempts.