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CVE-2021-43839

7.5 · HIGH

Cronos is a commercial implementation of a blockchain.

Published Dec 21, 2021CWE-670EPSS 1.36%

Overview

CVE-2021-43839 is a high-severity vulnerability. It was published on December 21, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8GitHubgithub.com/crypto-org-chain/cronos/pull/270GitHubgithub.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9rGitHubgithub.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8GitHubgithub.com/crypto-org-chain/cronos/pull/270GitHubgithub.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9r

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43839?

CVE-2021-43839 is a high-severity vulnerability. It was published on December 21, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-43839?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43839?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43839?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43839 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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