PT-2020-10820 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2020-06-23 · CVE-2019-20857

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Mattermost Server versions prior to 5.16.0

Description An issue allows attackers to cause a denial of service via many backtick characters, resulting in a markdown renderer hang.

Recommendations For versions prior to 5.16.0, update to version 5.16.0 or later to resolve the issue. As a temporary workaround, consider restricting the use of backtick characters in markdown rendering until a patch is available.

Fix

Related Identifiers

CVE-2019-20857

Affected Products

Mattermost Server

References · 3

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-20857 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20857 · Security Note