CVE-2026-0710 in SIPp
Summary
by MITRE • 01/23/2026
A flaw was found in SIPp. A remote attacker could exploit this by sending specially crafted Session Initiation Protocol (SIP) messages during an active call. This vulnerability, a NULL pointer dereference, can cause the application to crash, leading to a denial of service. Under specific conditions, it may also allow an attacker to execute unauthorized code, compromising the system's integrity and availability.
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Analysis
by VulDB Data Team • 01/25/2026
The vulnerability identified as CVE-2026-0710 represents a critical security flaw within SIPp, a widely used open-source tool for testing Session Initiation Protocol implementations. This tool serves as a powerful testing framework for VoIP systems, enabling network administrators and security professionals to validate SIP server configurations and identify potential weaknesses in communication infrastructure. The vulnerability manifests as a NULL pointer dereference condition that occurs when the application processes specially crafted SIP messages during active call sessions. This flaw exists within the application's message parsing and handling mechanisms, where insufficient input validation allows maliciously constructed SIP packets to trigger unexpected behavior in the software's memory management operations.
The technical exploitation of this vulnerability begins with an attacker sending malformed SIP messages that contain crafted parameters designed to trigger the NULL pointer dereference condition. When SIPp processes these malicious inputs during an active call, the application attempts to access a memory location that has not been properly initialized or allocated, resulting in an immediate crash of the application process. This crash represents a direct denial of service condition that disrupts legitimate call processing and testing operations. The vulnerability's severity escalates under specific environmental conditions where the application's memory state allows for potential code execution, transforming what initially appears to be a simple denial of service into a more dangerous remote code execution threat. This transformation occurs through the exploitation of memory corruption patterns that can be manipulated to redirect program execution flow.
From an operational perspective, this vulnerability poses significant risks to organizations that rely on SIPp for network testing and validation activities. The denial of service component effectively prevents legitimate testing operations from completing successfully, potentially leaving network vulnerabilities undetected and unaddressed. The remote code execution capability further compounds the threat by allowing attackers to compromise the underlying system hosting the SIPp tool, potentially providing them with unauthorized access to network resources and sensitive information. This vulnerability directly impacts the availability and integrity of communication systems, as it can be exploited from remote locations without requiring authentication or physical access to the target system. The attack surface extends to any environment where SIPp is deployed for testing purposes, including enterprise networks, telecommunications providers, and security testing organizations.
The vulnerability aligns with CWE-476, which specifically addresses NULL pointer dereference conditions, and represents a classic example of improper input validation in network protocol handling. From an ATT&CK framework perspective, this vulnerability maps to multiple techniques including T1499.004 for network denial of service and potentially T1059.007 for command and scripting interpreter execution. Organizations should immediately implement mitigations including applying the latest available patches from the SIPp project maintainers, implementing network segmentation to isolate SIPp testing environments, and deploying intrusion detection systems to monitor for suspicious SIP traffic patterns. Additionally, administrators should consider restricting network access to SIPp instances and implementing strict input validation policies for all SIP message processing within testing environments to prevent exploitation of this and similar vulnerabilities.