# CVE-2019-20925

## Summary

- **CVE ID:** CVE-2019-20925
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-839
- **Published:** Nov 24, 2020
- **Last Modified:** Mar 14, 2026

## Description

An unauthenticated client can trigger denial of service by issuing specially crafted wire protocol messages, which cause the message decompressor to incorrectly allocate memory. This issue affects MongoDB Server v4.2 versions prior to 4.2.1; MongoDB Server v4.0 versions prior to 4.0.13; MongoDB Server v3.6 versions prior to 3.6.15 and MongoDB Server v3.4 versions prior to 3.4.24.

## Affected Products

- MongoDB Inc. — MongoDB Server (4.2)
- MongoDB Inc. — MongoDB Server (4.0)
- MongoDB Inc. — MongoDB Server (3.6)
- MongoDB Inc. — MongoDB Server (3.4)

## References

- [CNA](https://jira.mongodb.org/browse/SERVER-43751)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 64.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._