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CVE-2021-21369

6.5 · MEDIUM

Hyperledger Besu is an open-source, MainNet compatible, Ethereum client written in Java.

Published Mar 9, 2021CWE-400EPSS 1.67%

Overview

CVE-2021-21369 is a medium-severity vulnerability. It was published on March 9, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Hyperledger Besu is an open-source, MainNet compatible, Ethereum client written in Java. In Besu before version 1.5.1 there is a denial-of-service vulnerability involving the HTTP JSON-RPC API service. If username and password authentication is enabled for the HTTP JSON-RPC API service, then prior to making any requests to an API endpoint the requestor must use the login endpoint to obtain a JSON web token (JWT) using their credentials. A single user can readily overload the login endpoint with invalid requests (incorrect password). As the supplied password is checked for validity on the main vertx event loop and takes a relatively long time this can cause the processing of other valid requests to fail. A valid username is required for this vulnerability to be exposed. This has been fixed in version 1.5.1.

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/hyperledger/besu/blob/master/CHANGELOG.md#151GitHubgithub.com/hyperledger/besu/commit/06e35a58c07a30c0fbdc0aae45a3e8b06b53c022GitHubgithub.com/hyperledger/besu/pull/1144GitHubgithub.com/hyperledger/besu/security/advisories/GHSA-qgfj-mjpc-7w3qGitHubgithub.com/hyperledger/besu/blob/master/CHANGELOG.md#151GitHubgithub.com/hyperledger/besu/commit/06e35a58c07a30c0fbdc0aae45a3e8b06b53c022GitHubgithub.com/hyperledger/besu/pull/1144GitHubgithub.com/hyperledger/besu/security/advisories/GHSA-qgfj-mjpc-7w3q

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21369?

CVE-2021-21369 is a medium-severity vulnerability. It was published on March 9, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-21369?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-21369?

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-2021-21369?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21369 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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