CVE-2025-66368 in Exynos 1080
Summary
by MITRE • 11/05/2026
Incorrect handling of SDP payload leads to a Denial of Service
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Analysis
by VulDB Data Team • 11/05/2026
The vulnerability described involves an incorrect handling of Session Description Protocol (SDP) payloads within a networked application or service, which can lead to a denial of service condition. The Session Description Protocol is widely used in multimedia communication sessions for negotiating parameters such as media types, addresses, and ports between endpoints. When processing incoming SDP messages, the software fails to properly validate, parse, or manage the structure and content of these payloads. This flaw typically manifests when specific malformed, excessively large, or structurally invalid SDP packets are received by the target system. Instead of gracefully rejecting such inputs with an appropriate error response, the application enters a state where it cannot continue normal operations, resulting in service interruption for legitimate users.
From a technical perspective, this issue often stems from buffer overflows, infinite loops triggered by malformed data structures, or unhandled exceptions during the parsing phase. For instance, if the parser does not correctly bound-check array indices when processing media descriptions within the SDP body, it may attempt to access memory locations outside its allocated space. Alternatively, recursive parsing logic might fail to detect deeply nested or circular references in the payload structure, causing the processor to consume all available CPU resources until the system becomes unresponsive. In some cases, the failure occurs because the application attempts to allocate excessive amounts of memory based on incorrect size fields within the SDP message, leading to out-of-memory conditions that crash the process or force a restart by the operating system's watchdog mechanisms.
The operational impact of this vulnerability is significant for any service relying on real-time communication capabilities such as VoIP, video conferencing, or streaming media platforms. An attacker can exploit this flaw remotely without authentication in many scenarios by sending specially crafted SDP packets to the affected port. This allows for a remote denial of service attack that disrupts availability, which is one of the three pillars of the CIA triad (Confidentiality, Integrity, Availability). The disruption may be temporary if the service auto-recovers but can also lead to persistent downtime if manual intervention or configuration changes are required to clear stuck states. For enterprise environments, this translates directly into lost productivity, failed customer interactions, and potential SLA violations due to unavailability of critical communication channels.
This vulnerability aligns with CWE-20 Improper Input Validation and CWE-400 Resource Exhaustion within the Common Weakness Enumeration framework. It is also categorized under MITRE ATT&CK technique T1499 Endpoint Denial of Service, specifically reflecting methods that exploit software vulnerabilities to degrade system performance or availability rather than using resource exhaustion attacks like volumetric flooding. The lack of robust input sanitization and error handling constitutes a fundamental security design flaw where the principle of least privilege is not applied to data processing routines, allowing untrusted external inputs to dictate internal control flow in dangerous ways.
Mitigation strategies should focus on implementing strict validation rules for all incoming SDP payloads before they are processed by core application logic. Developers must ensure that string lengths, integer values representing media attributes, and structural hierarchies adhere to expected RFC standards such as RFC 4566. Implementing rate limiting can help mitigate the frequency of attack attempts while deeper fixes are deployed. Additionally, deploying network-level protections like intrusion prevention systems configured with signatures for malformed SDP packets can provide an additional layer of defense by dropping suspicious traffic before it reaches the vulnerable application. Regular security testing including fuzzing campaigns targeting SIP and SDP parsers is essential to identify such edge cases early in the development lifecycle.