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CVE-2021-43790

8.5 · HIGH

Lucet is a native WebAssembly compiler and runtime.

Published Nov 30, 2021CWE-416EPSS 1.62%

Overview

CVE-2021-43790 is a high-severity vulnerability. It was published on November 30, 2021 and has a CVSS 3.1 base score of 8.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Lucet is a native WebAssembly compiler and runtime. There is a bug in the main branch of `lucet-runtime` affecting all versions published to crates.io that allows a use-after-free in an Instance object that could result in memory corruption, data race, or other related issues. This bug was introduced early in the development of Lucet and is present in all releases. As a result of this bug, and dependent on the memory backing for the Instance objects, it is possible to trigger a use-after-free when the Instance is dropped. Users should upgrade to the main branch of the Lucet repository. Lucet no longer provides versioned releases on crates.io. There is no way to remediate this vulnerability without upgrading.

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

Refcrates.io/crates/lucet-runtimeGitHubgithub.com/bytecodealliance/lucet/commit/7c7757c772fb709c61b1442bcc1e1fbee97bf4a8GitHubgithub.com/bytecodealliance/lucet/security/advisories/GHSA-hf79-8hjp-rrvqRefcrates.io/crates/lucet-runtimeGitHubgithub.com/bytecodealliance/lucet/commit/7c7757c772fb709c61b1442bcc1e1fbee97bf4a8GitHubgithub.com/bytecodealliance/lucet/security/advisories/GHSA-hf79-8hjp-rrvq

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43790?

CVE-2021-43790 is a high-severity vulnerability. It was published on November 30, 2021 and has a CVSS 3.1 base score of 8.5 (HIGH).

How severe is CVE-2021-43790?

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-43790?

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-2021-43790?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43790 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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