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The main reason for the standardization of network protocols, like QUIC, isto ensure interoperability between implementations, which poses a challengingtask. Manual tests are currently used to test the different existingimplementations for interoperability, but given the complex nature of networkprotocols, it is hard to cover all possible edge cases.  State-of-the-art automated software testing techniques, such as SymbolicExecution (SymEx), have proven themselves capable of analyzing complexreal-world software and finding hard to detect bugs. We present a SymEx-basedmethod for finding interoperability issues in QUIC implementations, and exploreits merit in a case study that analyzes the interoperability of picoquic andQUANT. We find that, while SymEx is able to analyze deep interactions betweendifferent implementations and uncovers several bugs, in order to enableefficient interoperability testing, implementations need to provide additionalinformation about their current protocol state.

Interoperability-Guided Testing of QUIC Implementations using Symbolic Execution