CVE-2019-16215

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.51%
Vendor Advisory zulip.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/ vendor advisory
https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2019-16215?
CVE-2019-16215 has been scored as a medium severity vulnerability.
How to fix CVE-2019-16215?
To fix CVE-2019-16215, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-16215 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-16215 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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