Blockchain protocols

This is a vulnerability classification table for blockchain protocols (v2.0)

Critical

• Direct theft of funds

• Permanent freezing of funds

• Total network shutdown (not able to confirm new transactions). Fix requires a hardfork.

High

• Application level DoS (which leads to crushing of any node). It is possible to firewall-out the attacker.

• Temporary freezing of network transactions

• Temporary freezing of funds

Medium

• Application level DoS which leads to shutdown of minor part of nodes

• Unintended smart contract behavior

Low

• A shutdown of less than 25% of network processing nodes (no brute force actions)

• Modification of transaction fees

If the issue is not under one of the mentioned vulnerabilities, we use the Common Vulnerability Scoring System to assess the severity of your vulnerability.