Case Study · Security
XION Protocol
Helping a US-based blockchain protocol stay safe for the people who use it.
- Client
- XION Protocol (USA)
- Scope
- Security research, responsible disclosure
- Program
- Immunefi Bug Bounty
- Year
- 2025
Context
XION is a public blockchain serving users across the United States. Like every protocol of its scale, it runs an active bug-bounty program where independent security researchers help harden the network before issues reach production.
What we found
We identified a critical flaw in XION's fee enforcement that could have allowed bad actors to consume unlimited network resources without paying for them. Left unfixed, the issue would have undermined the chain's economic security and opened the door to denial-of-service attacks against the entire network.
How we worked
We submitted a detailed report through Immunefi's bug-bounty program with full reproduction steps and a working proof of concept. From there we worked directly with the XION team to confirm the impact, agree on severity, and propose a precise fix that closes the gap without affecting how the network handles legitimate transactions.
Outcome
XION confirmed the vulnerability and rewarded the disclosure in May 2025. The fix shipped, the chain runs more resiliently, and the public report stands as a reference for future security work on the protocol.