---
cve: "CVE-2021-20330"
severity: "MEDIUM"
cvss: 6.5
epss: "1%"
vendor: "MongoDB Inc."
kev: false
exploited: false
published: "2021-12-15 13:15:07"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T03:04:57+02:00"
---

# CVE-2021-20330

> 6.5 MEDIUM

## Beschreibung

An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 89306fde6167fa12ea6e30d61e05791e8e214e55 (Commit)
- 0e6db36e92d82cc81cbd40ffd607eae88dc1f09d (Commit)

## Referenzen

- <https://jira.mongodb.org/browse/SERVER-36263>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-20330) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_