CVE-2021-21320
2.6 · LOWOverview
CVE-2021-21320 is a low-severity vulnerability affecting matrix-react-sdk_project matrix-react-sdk. It was published on March 2, 2021 and has a CVSS 3.1 base score of 2.6 (LOW).
This vulnerability has a CVSS 3.1 base score of 2.6, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0.
Remediation
Check the references section for vendor advisories and patches from matrix-react-sdk_project. Update matrix-react-sdk 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 |
|---|---|---|---|
| matrix-react-sdk_project | matrix-react-sdk | >= 0, < 3.15.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-21320?
CVE-2021-21320 is a low-severity vulnerability affecting matrix-react-sdk_project matrix-react-sdk. It was published on March 2, 2021 and has a CVSS 3.1 base score of 2.6 (LOW).
How severe is CVE-2021-21320?
This vulnerability has a CVSS 3.1 base score of 2.6, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-21320?
Check the references section for vendor advisories and patches from matrix-react-sdk_project. Update matrix-react-sdk 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-2021-21320?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-21320 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.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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