Is CVE-2021-3840 actively exploited?

No active exploitation of CVE-2021-3840 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-3840 be exploited remotely?

Yes. CVE-2021-3840 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-3840?

CVE-2021-3840 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-3840

CWE-427Published: November 12, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

A dependency confusion vulnerability was reported in the Antilles open-source software prior to version 1.0.1 that could allow for remote code execution during installation due to a package listed in requirements.txt not existing in the public package index (PyPi). MITRE classifies this weakness as an Uncontrolled Search Path Element (CWE-427) in which a private package dependency may be replaced by an unauthorized package of the same name published to a well-known public repository such as PyPi. The configuration has been updated to only install components built by Antilles, removing all other public package indexes. Additionally, the antilles-tools dependency has been published to PyPi.

NVD Source

Technical Analysis

CVE-2021-3840 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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 8.8.