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Vulnerabilities

Vulnerability · CVE-2019-20925

An unauthenticated client can trigger denial of service by issuing specially crafted wire protocol messages, which cause the message decompressor to incorrectly allocate memory.

Published Nov 24, 2020 · catalog updated Jun 17, 2026 · An unauthenticated client can

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2019-20925. EPSS is 1.68%. Act only if a listed version of An unauthenticated client can is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An unauthenticated client can).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.68%
Remediation
Version ranges on file
Affected products
cpe mongodb/mongodb

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mongodb/mongodb< 3.4.24
  • cpe mongodb/mongodb< 3.6.15
  • cpe mongodb/mongodb< 4.0.13
  • cpe mongodb/mongodb< 4.2.1

How to fix CVE-2019-20925

  • Upgrade

    CVE-2019-20925 lists a fix boundary at 3.4.24. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 3.4.24

  • Advisory

    Open the inventory_high record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2019-20925. EPSS is 1.68%. Act only if a listed version of An unauthenticated client can is installed.

Which versions are affected?

Compare what you have installed with < 3.4.24, < 3.6.15, < 4.0.13, < 4.2.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-697; CWE-839. EPSS 1.68%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

MongoDB security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 24, 2020 · Monitored products — high

    Detected

    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.

  2. Jun 17, 2026 · Monitored products — high

    Updated

    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.

Sources

  • Monitored products — highVendor advisoryCVE-2019-20925

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — highNov 1, 2026