Input validation error in Mattermost Server - CVE-2019-20871
Published: June 19, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34235
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2019-20871
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.
Affected software
Mattermost Server
How to mitigate CVE-2019-20871
Install update from vendor's website.
Mattermost Server - update to 5.8.1