CVE-2021-39187

Crash server with query parameter

HIGH
7.5
CVSS Score
Published: September 2, 2021 at 03:35 PM UTC
Updated: June 17, 2026 at 04:03 AM UTC
2 products affected across 2 vendorsParse ServerParse Server

Using parse-server by parse-community?

Get instant alerts when new vulnerabilities affect parse-server - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to version 4.10.3, Parse Server crashes when if a query request contains an invalid value for the `explain` option. This is due to a bug in the MongoDB Node.js driver which throws an exception that Parse Server cannot catch. There is a patch for this issue in version 4.10.3. No workarounds aside from upgrading are known to exist.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.10.3
Affected range stops below 4.10.3, so it looks safe — our inference, not a vendor statement
v < 4.10.3
Affected range stops below 4.10.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74CWE-755

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card