Input validation error in Mattermost Server - CVE-2019-20857
Published: June 19, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34237
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-20857
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mattermost, Inc.
Affected software:
Mattermost Server
Mattermost Server
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
An issue was discovered in Mattermost Server before 5.16.0. It allows attackers to cause a denial of service (markdown renderer hang) via many backtick characters.
How to mitigate CVE-2019-20857
Install update from vendor's website.