SIPp 3.6 and earlier contains a local buffer overflow vulnerability in command-line argument handling that allows local attackers to crash the application or execute arbitrary code. Attackers can trigger the vulnerability by supplying oversized input to the -3pcc, -i, or -log_file parameters, causing strcpy to write beyond buffer boundaries in sipp.cpp.

SIPP 3.3 contains a stack-based buffer overflow vulnerability that allows local unauthenticated attackers to execute arbitrary code by supplying malicious input in the configuration file. Attackers can craft a configuration file with oversized values that overflow a stack buffer, overwriting the return address and executing arbitrary code through return-oriented programming gadgets.

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.