CVE-2025-52919 in YMCS RPS
Summary
by MITRE • 06/22/2025
In Yealink YMCS RPS before 2025-05-26, the certificate upload function does not properly validate certificate content, potentially allowing invalid certificates to be uploaded.
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Analysis
by VulDB Data Team • 06/30/2025
The vulnerability identified as CVE-2025-52919 affects the Yealink YMCS RPS software version prior to the 2025-05-26 release, specifically targeting the certificate upload functionality within the system. This represents a critical security flaw that undermines the integrity of the certificate management process. The issue stems from insufficient validation mechanisms during the certificate upload procedure, which creates an avenue for malicious actors to potentially bypass security controls through the submission of invalid or malformed certificates. The vulnerability falls under the category of improper input validation, a common weakness that can lead to various downstream security implications.
The technical flaw manifests in the certificate upload function's failure to properly validate certificate content before acceptance into the system. This inadequate validation process allows certificates that do not meet required security standards or contain malformed data to be successfully uploaded and potentially utilized within the system. The vulnerability essentially creates a trust boundary failure where the system cannot reliably distinguish between valid and invalid certificates, potentially enabling attackers to substitute malicious certificates for legitimate ones. This weakness directly relates to CWE-20, which addresses improper input validation, and represents a failure in the certificate validation lifecycle that should normally enforce strict cryptographic standards and integrity checks.
The operational impact of this vulnerability extends beyond simple certificate management issues and could enable significant security compromise within affected systems. An attacker who successfully exploits this vulnerability could potentially install malicious certificates that would be trusted by the system, leading to man-in-the-middle attacks, unauthorized access to system resources, or the ability to impersonate legitimate services. The implications are particularly concerning given that certificate validation is fundamental to establishing secure communications and maintaining system integrity. This vulnerability could also facilitate privilege escalation attacks where attackers leverage the compromised certificate trust model to gain elevated system privileges or access to restricted resources. The potential for lateral movement within networks and persistent access makes this a particularly dangerous weakness in security infrastructure.
Mitigation strategies for CVE-2025-52919 should prioritize immediate software updates to the Yealink YMCS RPS platform to the patched version released on or after 2025-05-26. Organizations should also implement additional monitoring of certificate upload activities and establish automated validation processes to detect anomalous certificate submissions. Security teams should conduct thorough certificate audits to identify any potentially compromised certificates that may have been uploaded through this vulnerability. The implementation of certificate pinning mechanisms and enhanced cryptographic validation procedures can provide additional layers of protection. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and defense evasion, as attackers could use compromised certificates to maintain persistent access while evading detection mechanisms that rely on certificate validation. Organizations should also consider implementing network segmentation and enhanced logging to detect suspicious certificate-related activities that may indicate exploitation attempts.