CVE-2018-3721: lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability vi

This month

MEDIUM 6.5UPGRADEMITIGATEMITIGATE

CVE-2018-3721 is a medium-severity flaw (CVSS 6.5) affecting lodash, active iq unified manager, active iq unified manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.3% (top 16%)
CISA exploited list	No
Weakness	CWE-471, CWE-1321
Published	2018-06-07
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: lodash · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-06-07 02:29 UTCPublished CVE record published
2026-06-17 01:57 UTCUpdated Record last modified

lodash lodash UPGRADE

Affected: < 4.17.5

Fixed in: 4.17.5

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls lodash

2. UPGRADE to 4.17.5

npm install lodash@">=4.17.5"

netapp active iq unified manager MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-iq-unified-manager || rpm -q active-iq-unified-manager || active-iq-unified-manager --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp active iq unified manager MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-iq-unified-manager || rpm -q active-iq-unified-manager || active-iq-unified-manager --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp active iq unified manager MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-iq-unified-manager || rpm -q active-iq-unified-manager || active-iq-unified-manager --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp system manager DOWNGRADE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

1. Check installed version

apt-cache policy system-manager || rpm -q system-manager || system-manager --version

2. No fixed release: DOWNGRADE to a release before 9.0 (Debian / Ubuntu)

apt-cache madison system-manager sudo apt install system-manager=<VERSION_BEFORE_9.0> sudo apt-mark hold system-manager

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list system-manager sudo dnf downgrade system-manager-<VERSION_BEFORE_9.0> sudo dnf versionlock add system-manager

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-3721?

lodash: upgrade to 4.17.5; active iq unified manager: mitigate or apply the listed mitigation; active iq unified manager: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-3721 being exploited?

CVE-2018-3721 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-3721 affect?

CVE-2018-3721 affects lodash, active iq unified manager, active iq unified manager. Severity is medium (CVSS 6.5). 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__, c

How urgent is CVE-2018-3721?

Priority 49/100. Public exploit reference

Software pages

Lodash vulnerabilities

Related CVEs

CVE-2025-13465 MEDIUM 5.3 UPGRADE The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution
CVE-2021-23337 HIGH 7.2 UPGRADE DOWNGRADE Lodash versions prior to 4.17.21 are vulnerable to Command Injection via the template function.
CVE-2020-28500 MEDIUM 5.3 UPGRADE DOWNGRADE Lodash versions prior to 4.17.21 are vulnerable to Regular Expression Denial of Service (ReDoS) via the toNumb
CVE-2020-8203 HIGH 7.4 UPGRADE DOWNGRADE Prototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.
CVE-2019-10744 CRITICAL 9.1 UPGRADE MITIGATE Versions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution

References

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