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CVE-2021-41110

9.1 · CRITICAL

cwlviewer is a web application to view and share Common Workflow Language workflows.

Published Oct 1, 2021CWE-502EPSS 2.81%

Overview

CVE-2021-41110 is a critical-severity vulnerability. It was published on October 1, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

cwlviewer is a web application to view and share Common Workflow Language workflows. Versions prior to 1.3.1 contain a Deserialization of Untrusted Data vulnerability. Commit number f6066f09edb70033a2ce80200e9fa9e70a5c29de (dated 2021-09-30) contains a patch. There are no available workarounds aside from installing the patch. The SnakeYaml constructor, by default, allows any data to be parsed. To fix the issue the object needs to be created with a `SafeConstructor` object, as seen in the patch.

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/common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29deGitHubgithub.com/common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7Refwww.fatalerrors.org/a/analysis-of-the-snakeyaml-deserialization-in-java-security.htmlGitHubgithub.com/common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29deGitHubgithub.com/common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7Refwww.fatalerrors.org/a/analysis-of-the-snakeyaml-deserialization-in-java-security.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41110?

CVE-2021-41110 is a critical-severity vulnerability. It was published on October 1, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2021-41110?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-41110?

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-2021-41110?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41110 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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