What is the severity of CVE-2019-20871?

CVE-2019-20871 is classified as a medium to high severity vulnerability due to its potential for denial of service through catastrophic backtracking.

How do I fix CVE-2019-20871?

To fix CVE-2019-20871, upgrade to Mattermost Server version 5.9.0 or later, or apply the relevant patches provided by Mattermost.

What versions of Mattermost are affected by CVE-2019-20871?

Mattermost Server versions prior to 5.9.0, 5.8.1, 5.7.3, and 4.10.8 are affected by CVE-2019-20871.

What type of vulnerability is CVE-2019-20871?

CVE-2019-20871 is a denial of service vulnerability related to the Markdown library used in Mattermost Server.

Is there a workaround for CVE-2019-20871?

While the best course of action is to upgrade, you may review your instance's configurations, though there are no officially recommended workarounds for this vulnerability.

Vulnerability/
CVE-2019-20871

high

7.5

19/6/2020

5/8/2024

CVE-2019-20871

First published: Fri Jun 19 2020(Updated: )

An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Mattermost	<4.10.8
Mattermost	>=5.7.0<5.7.3
Mattermost	>=5.8.0<5.8.1
Mattermost	=5.9.0-rc1
Mattermost	=5.9.0-rc2
Mattermost	=5.9.0-rc3
Mattermost	=5.9.0-rc4

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Reference Links

https://mattermost.com/security-updates/

Frequently Asked Questions

What is the severity of CVE-2019-20871?
CVE-2019-20871 is classified as a medium to high severity vulnerability due to its potential for denial of service through catastrophic backtracking.
How do I fix CVE-2019-20871?
To fix CVE-2019-20871, upgrade to Mattermost Server version 5.9.0 or later, or apply the relevant patches provided by Mattermost.
What versions of Mattermost are affected by CVE-2019-20871?
Mattermost Server versions prior to 5.9.0, 5.8.1, 5.7.3, and 4.10.8 are affected by CVE-2019-20871.
What type of vulnerability is CVE-2019-20871?
CVE-2019-20871 is a denial of service vulnerability related to the Markdown library used in Mattermost Server.
Is there a workaround for CVE-2019-20871?
While the best course of action is to upgrade, you may review your instance's configurations, though there are no officially recommended workarounds for this vulnerability.

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