CVE-2018-25356: SIPp 3.6 Local Buffer Overflow via Command-line Arguments

Security readout for executives and security teams

SIPp is an open-source tool used by voice engineers to test SIP telephony systems. Versions 3.6 and earlier have a flaw in how they process oversized command-line arguments, which can crash the program or let a local user run unintended code. Because the attacker must already have local access to the host, business impact is contained but still meaningful on shared test rigs. Exposure is limited to hosts where SIPp 3.6 or earlier is installed and invoked with attacker-influenced command-line arguments. Typical footprints include VoIP QA labs, load-generation servers, CI runners, and telecom engineering workstations. Systems that wrap SIPp in scripts fed by untrusted parameters, or multi-user test hosts, face the greatest realistic risk. Treat as a moderate, non-urgent hygiene item. The flaw needs local access, so it does not threaten internet-facing services, but shared VoIP test labs and CI runners should be inventoried and updated during the next maintenance window. No evidence of active exploitation was cited in the provided sources. Mitigation focus: Inventory hosts running SIPp 3.6 or earlier and identify who invokes them.; Restrict SIPp execution to trusted users and dedicated non-production test hosts.; Check the SIPp GitHub releases page for a fixed build and upgrade when available..

Prepared

Jul 11, 2026, 06:12 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.