CVE-2021-43839: Crypto Cronos

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Cronos is a commercial implementation of a blockchain. In Cronos nodes running versions before v0.6.5, it is possible to take transaction fees from Cosmos SDK's FeeCollector for the current block by sending a custom crafted MsgEthereumTx. This problem has been patched in Cronos v0.6.5. There are no tested workarounds. All validator node operators are recommended to upgrade to Cronos v0.6.5 at their earliest possible convenience.

Affected products

• Crypto Cronos: before 0.6.5 (fixed in 0.6.5)
• Crypto Ethermint: before 0.7.3 (fixed in 0.7.3); from 0.8.0, up to and including 0.9.0
• Crypto Evmos: up to and including 0.4.2

Published 2021-12-21. Last modified 2026-06-17.