VULNERABILITY INTELLIGENCE

CVE-2019-16215

CVSS score6.5 MEDIUM

EPSS probability1.25%

CISA KEVNot currently listed

Published2019-09-18

Last modified2026-06-17

Description

The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages.