CVE-2021-43861
7.2 · HIGHOverview
CVE-2021-43861 is a high-severity vulnerability affecting mermaid_project mermaid. It was published on December 30, 2021 and has a CVSS 3.1 base score of 7.2 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Mermaid is a Javascript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. Prior to version 8.13.8, malicious diagrams can run javascript code at diagram readers' machines. Users should upgrade to version 8.13.8 to receive a patch. There are no known workarounds aside from upgrading.
Remediation
Check the references section for vendor advisories and patches from mermaid_project. Update mermaid to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mermaid_project | mermaid | >= 0, < 8.13.8 | Affected |
References
Frequently Asked Questions
What is CVE-2021-43861?
CVE-2021-43861 is a high-severity vulnerability affecting mermaid_project mermaid. It was published on December 30, 2021 and has a CVSS 3.1 base score of 7.2 (HIGH).
How severe is CVE-2021-43861?
This vulnerability has a CVSS 3.1 base score of 7.2, 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-2021-43861?
Check the references section for vendor advisories and patches from mermaid_project. Update mermaid to the latest patched version. 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-2021-43861?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-43861 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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