{"id":"CVE-2019-16215","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-16215","generatedAt":"2026-10-28T21:31:50.174Z","title":"The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking.","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.","published":"2019-09-18T12:15:11.000Z","lastModified":"2026-06-17T02:21:55.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-1333"],"affected":["zulip/zulip server"],"epss":{"score":0.01249,"percentile":0.69227,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.25%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-16215","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}