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CVE-2021-29453

5.7 · MEDIUM

matrix-media-repo is an open-source multi-domain media repository for Matrix.

Published Apr 19, 2021CWE-400EPSS 1.00%

Overview

CVE-2021-29453 is a medium-severity vulnerability. It was published on April 19, 2021 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

matrix-media-repo is an open-source multi-domain media repository for Matrix. Versions 1.2.6 and earlier of matrix-media-repo do not properly handle malicious images which are crafted to be small in file size, but large in complexity. A malicious user could upload a relatively small image in terms of file size, using particular image formats, which expands to have extremely large dimensions during the process of thumbnailing. The server can be exhausted of memory in the process of trying to load the whole image into memory for thumbnailing, leading to denial of service. Version 1.2.7 has a fix for the vulnerability.

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/turt2live/matrix-media-repo/releases/tag/v1.2.7GitHubgithub.com/turt2live/matrix-media-repo/security/advisories/GHSA-j889-h476-hh9hRefhub.docker.com/r/turt2live/matrix-media-repo/tags?page=1&ordering=last_updatedGitHubgithub.com/turt2live/matrix-media-repo/releases/tag/v1.2.7GitHubgithub.com/turt2live/matrix-media-repo/security/advisories/GHSA-j889-h476-hh9hRefhub.docker.com/r/turt2live/matrix-media-repo/tags?page=1&ordering=last_updated

How CyberStrike helps

Frequently asked questions

What is CVE-2021-29453?

CVE-2021-29453 is a medium-severity vulnerability. It was published on April 19, 2021 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2021-29453?

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-29453?

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-2021-29453?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-29453 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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