CVE-2021-39187Crash server with query parameter
- 7.5HighCVSS base score
- 1.8%Exploitation in 30 daysEPSS · top 21% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_M
- 17 days later
· 17 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.8% · top 21% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
parse-community · parse-server
- affected < 4.10.3
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmparse-serverGHSA-xqp8-w826-hh6x (opens in a new tab)
References
References4
- https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/parse-community/parse-server/commit/308668c89474223e2448be92d6823b52c1c313ec (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/parse-community/parse-server/releases/tag/4.10.3 (opens in a new tab)x_refsource_MISCx_transferred
- https://jira.mongodb.org/browse/NODE-3463 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-2135 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xqp8-w826-hh6x (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-39187)Record last updated .