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CVE-2021-21320

2.6 · LOW

matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript.

Published Mar 2, 2021CWE-345EPSS 0.92%

Overview

CVE-2021-21320 is a low-severity vulnerability. 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, 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/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1GitHubgithub.com/matrix-org/matrix-react-sdk/pull/5657GitHubgithub.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79xRefwww.npmjs.com/package/matrix-react-sdkGitHubgithub.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1GitHubgithub.com/matrix-org/matrix-react-sdk/pull/5657GitHubgithub.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79xRefwww.npmjs.com/package/matrix-react-sdk

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21320?

CVE-2021-21320 is a low-severity vulnerability. 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, 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-2021-21320?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21320 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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