CVE-2019-16215
mediumpriority · track · 26EPSS 0.012 · 69 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/cnnvd
- https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2019-16215cnnvd
- https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/enisa_euvd
- https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51enisa_euvd
- https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/Vendor Advisorynvd
- https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51PatchThird Party Advisorynvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan