CVE-2021-33420

Name: CVE-2021-33420
Creator: NVD / NIST
Published: 2022-12-15T19:15:15.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.61%

Last modified Jun 17, 2026

CVE-2021-33420 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A deserialization issue discovered in inikulin replicator before 1.0.4 allows remote attackers to run arbitrary code via the fromSerializable function in TypedArray object.. EPSS estimates a 1.61% chance of exploitation in the next 30 days.

Description

A deserialization issue discovered in inikulin replicator before 1.0.4 allows remote attackers to run arbitrary code via the fromSerializable function in TypedArray object.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.61%

72.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Replicator Project	Replicator	< 1.0.4

References

https://advisory.checkmarx.net/advisory/CX-2021-4787Exploit, Third Party Advisory
https://github.com/inikulin/replicator/commit/2c626242fb4a118855262c64b5731b2ce98e521bPatch, Third Party Advisory
https://github.com/inikulin/replicator/issues/16Third Party Advisory
https://github.com/inikulin/replicator/pull/17Third Party Advisory
https://advisory.checkmarx.net/advisory/CX-2021-4787Exploit, Third Party Advisory
https://github.com/inikulin/replicator/commit/2c626242fb4a118855262c64b5731b2ce98e521bPatch, Third Party Advisory
https://github.com/inikulin/replicator/issues/16Third Party Advisory
https://github.com/inikulin/replicator/pull/17Third Party Advisory

Timeline

Published: Dec 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33420?

A deserialization issue discovered in inikulin replicator before 1.0.4 allows remote attackers to run arbitrary code via the fromSerializable function in TypedArray object.

How severe is CVE-2021-33420?

CVE-2021-33420 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.61% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33420?

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-2021-33420?

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

Scan your code now

Source: NVD / NIST