CVE-2019-16215
MEDIUM
6.5
CVSS Score
Published: September 18, 2019 at 11:07 AM UTC
Updated: June 17, 2026 at 02:21 AM UTC
1 product affected across 1 vendorZulip Server
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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.0.5
Affected range stops below 2.0.5, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-1333
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