CVE-2023-33057 in 4 Gen 1 Mobile Platform
Summary
by MITRE • 02/06/2024
Transient DOS in Multi-Mode Call Processor while processing UE policy container.
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Analysis
by VulDB Data Team • 08/07/2025
The vulnerability identified as CVE-2023-33057 represents a transient denial of service condition within the Multi-Mode Call Processor component of telecommunications infrastructure. This issue specifically manifests during the processing of User Equipment policy containers which are essential for managing call setup and policy enforcement in mobile networks. The transient nature of this vulnerability indicates that the denial of service is not persistent but occurs intermittently during specific operational conditions, making it particularly challenging to detect and mitigate. The affected system components typically handle critical signaling functions that govern how mobile devices connect to network infrastructure and process call-related policies.
The technical flaw stems from inadequate input validation and error handling within the UE policy container processing logic. When malformed or unexpected policy container data is received, the Multi-Mode Call Processor fails to properly handle the exception, resulting in temporary service disruption. This processing failure typically occurs in the network's call control plane where policy decisions are made based on subscriber profiles and network conditions. The vulnerability exposes a weakness in the system's robustness when encountering edge cases in policy container format or content, potentially causing the processor to enter a degraded state where it cannot properly handle subsequent legitimate requests.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network reliability and user experience. During the transient denial of service period, legitimate calls may fail to establish properly or experience delays in policy application, affecting voice and data services for mobile subscribers. Network operators may observe increased call failure rates, dropped connections, and service degradation metrics that correlate with the timing of the vulnerability manifestation. The intermittent nature of the issue complicates troubleshooting and may lead to false positives in network monitoring systems, as operators might misattribute the service disruption to other network conditions or configuration issues.
Mitigation strategies for CVE-2023-33057 should focus on implementing robust input validation mechanisms and enhancing error handling procedures within the Multi-Mode Call Processor. Network administrators should deploy firmware updates from vendors that address the specific validation gaps in policy container processing. Additionally, implementing monitoring and alerting systems that can detect anomalous behavior in call processing patterns will help identify when the vulnerability is being triggered. The remediation process should include comprehensive testing of policy container handling procedures to ensure that the system properly rejects malformed inputs while maintaining functionality for valid policy containers. Security teams should also consider implementing network segmentation and rate limiting mechanisms to reduce the impact of potential exploitation attempts. This vulnerability aligns with CWE-20 Generalize Exception Handling and CWE-399 Resource Management Errors, representing a classic case of insufficient error handling in telecommunications infrastructure that can be exploited to create service disruption. The attack surface for this vulnerability typically involves network signaling interfaces where UE policy containers are exchanged between network elements, making it a target for both accidental misconfiguration and intentional exploitation attempts.