CVE-2021-4329: A vulnerability, which was classified as critical, has been found in json-logic-js 2.0.0

This month

MEDIUM 5.5DOWNGRADE

CVE-2021-4329 is a medium-severity flaw (CVSS 5.5) affecting json-logic-js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, has been found in json-logic-js 2.0.0. Affected by this issue is some unknown functionality of the file logic.js. The manipulation leads to command injection. Upgrading to version 2.0.1 is able to address this issue. The patch is identified as c1dd82f5b15d8a553bb7a0cfa841ab8a11a9c227. It is recommended to upgrade the affected component. VDB-222266 is the identifier assigned to this vulnerability.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-77
Published	2023-03-05
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: json-logic-js project

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

Am I affected?

Timeline

2023-03-05 19:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

json-logic-js project json-logic-js DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy json-logic-js || rpm -q json-logic-js || json-logic-js --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison json-logic-js sudo apt install json-logic-js=<VERSION_BEFORE_2.0.0> sudo apt-mark hold json-logic-js

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

dnf --showduplicates list json-logic-js sudo dnf downgrade json-logic-js-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add json-logic-js

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-2021-4329?

json-logic-js: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-4329 being exploited?

CVE-2021-4329 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-2021-4329 affect?

CVE-2021-4329 affects json-logic-js. Severity is medium (CVSS 5.5). A vulnerability, which was classified as critical, has been found in json-logic-js 2.0.0. Affected by this issue is some unknown functionality of the file logic.js. The manipulation leads to command injection. Upgrading to version 2.0.1 is

How urgent is CVE-2021-4329?

Priority 40/100. No elevated risk signals yet.

References

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