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• Service proxies are becoming increasingly complex data parsers
• Envoy supports HTTP protocol translation, payload decompression, gRPC-JSON transcoding, and many other features that operate directly on raw request bytes
• Malicious HTTP requests may trigger undefined behavior, resulting in service mesh downtime
• Coverage-guided fuzz tests capture intricate corner cases that a developer may have missed
• Integration with OSS Fuzz provides continuous fuzz testing and vulnerability reports
• Continuous fuzzing is essentially running fuzzers 24/7 in the background
• Coverage-guided fuzzers employ a feedback loop to generate inputs based on code coverage
• Optimization problem: fuzzers are trying to optimize against the input space and the loss function is inversely proportional to code coverage