What is CVE-2021-37865?

CVE-2021-37865 is a vulnerability in Mattermost 6.2 and earlier that allows authenticated users to cause a server-side Denial of Service by uploading a specially crafted GIF file.

How does CVE-2021-37865 impact the affected software?

CVE-2021-37865 affects Mattermost versions up to and including 6.2.0, causing resource exhaustion and server-side Denial of Service when an authenticated user uploads a specific GIF file while drafting a post.

What is the severity rating of CVE-2021-37865?

CVE-2021-37865 has a severity rating of medium, with a CVSS score of 5.7.

How can I mitigate CVE-2021-37865?

To mitigate CVE-2021-37865, it is recommended to update Mattermost to a version that includes the fix for the vulnerability.

Where can I find more information about CVE-2021-37865?

More information about CVE-2021-37865 can be found on the HackerOne report (https://hackerone.com/reports/1428260) and the Mattermost security updates page (https://mattermost.com/security-updates/).

Vulnerability/
CVE-2021-37865

medium

5.7

CWE

400

18/1/2022

4/8/2024

CVE-2021-37865: Server-side Denial of Service while processing a specifically crafted GIF file

First published: Tue Jan 18 2022(Updated: )

Mattermost 6.2 and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.

Credit: responsibledisclosure@mattermost.com

Affected Software	Affected Version	How to fix
Mattermost Mattermost	<=6.2.0

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Frequently Asked Questions

What is CVE-2021-37865?
CVE-2021-37865 is a vulnerability in Mattermost 6.2 and earlier that allows authenticated users to cause a server-side Denial of Service by uploading a specially crafted GIF file.
How does CVE-2021-37865 impact the affected software?
CVE-2021-37865 affects Mattermost versions up to and including 6.2.0, causing resource exhaustion and server-side Denial of Service when an authenticated user uploads a specific GIF file while drafting a post.
What is the severity rating of CVE-2021-37865?
CVE-2021-37865 has a severity rating of medium, with a CVSS score of 5.7.
How can I mitigate CVE-2021-37865?
To mitigate CVE-2021-37865, it is recommended to update Mattermost to a version that includes the fix for the vulnerability.
Where can I find more information about CVE-2021-37865?
More information about CVE-2021-37865 can be found on the HackerOne report (https://hackerone.com/reports/1428260) and the Mattermost security updates page (https://mattermost.com/security-updates/).

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vendor/mattermost
canonical/mattermost mattermost
version/mattermost mattermost/6.2.0

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