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CVE-2021-39187

Crash server with query parameter

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.82%Up 0.8 points since Sep 3, 2021
90%50%10%1%

What each source reports

CVE List Score used7.5

Crash server with query parameter

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.

Record
CVE-2021-39187
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-74
Updated
2026-11-02
EUVDEUVD-2021-21357.5

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.

Record
EUVD-2021-2135
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-xqp8-w826-hh6x7.5

Parse Server crashes with query parameter

Impact

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.

Patches

Upgrade to Parse Server 4.10.3

Record
GHSA-xqp8-w826-hh6x
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20, CWE-74, CWE-755
Updated
2026-11-02
NVD7.5

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.

Record
CVE-2021-39187
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-74, CWE-755
Updated
2026-11-02
OSV7.5

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.

Record
CVE-2021-39187
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVGHSA-xqp8-w826-hh6x7.5

Parse Server crashes with query parameter

Impact

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.

Patches

Upgrade to Parse Server 4.10.3

Record
GHSA-xqp8-w826-hh6x
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20, CWE-74, CWE-755
Updated
2026-11-02
OSVBIT-parse-2021-39187No score

Crash server with query parameter

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.

Record
BIT-parse-2021-39187
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
parse-server
npm
before 4.10.3
4.10.3
parse
Bitnami
before 4.10.3
4.10.3

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-39187 is a high vulnerability (CVSS 7.5) in Parse-community Parse-server, published September 2, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.82%, the 79th percentile. Fixed in parse-server 4.10.3.

References

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