CVE-2018-3721

Name: CVE-2018-3721
Creator: NVD / NIST
Published: 2018-06-07T02:29:08.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.41%

Last modified Jun 17, 2026

CVE-2018-3721 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith functions, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.. EPSS estimates a 2.41% chance of exploitation in the next 30 days.

Description

lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith functions, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

2.41%

82.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Lodash	Lodash	< 4.17.5
Netapp	Active Iq Unified Manager	All versions
Netapp	System Manager	9.0

References

https://github.com/lodash/lodash/commit/d8e069cc3410082e44eb18fcf8e7f3d08ebe1d4aPatch
https://hackerone.com/reports/310443Exploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190919-0004/Third Party Advisory
https://github.com/lodash/lodash/commit/d8e069cc3410082e44eb18fcf8e7f3d08ebe1d4aPatch
https://hackerone.com/reports/310443Exploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190919-0004/Third Party Advisory

Timeline

Published: Jun 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-3721?

How severe is CVE-2018-3721?

CVE-2018-3721 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.41% probability of exploitation in the next 30 days.

How do I fix CVE-2018-3721?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-3721?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST