CVE-2021-33420
CWE-502Published: December 15, 2022· Updated: Jun 17, 2026
Official 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.
Risk Analysis
The inikulin replicator library before 1.0.4 is vulnerable to a deserialization issue that allows remote attackers to execute arbitrary code. This critical flaw is rated 9.8 on the CVSS scale.
No public exploit is known, and the vulnerability is not in the KEV catalog. It is remotely exploitable with low complexity.
Upgrade the replicator library to version 1.0.4 or later.
Technical Analysis
CVE-2021-33420 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (8)
Quick Facts
Related CVEs (CWE-502)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-33420 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts