Is CVE-2020-14000 actively exploited?

No active exploitation of CVE-2020-14000 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-14000 be exploited remotely?

Yes. CVE-2020-14000 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-14000?

CVE-2020-14000 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-14000

CRITICAL

CVE-2020-14000

CWE-502Published: July 16, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.

NVD Source

Technical Analysis

CVE-2020-14000 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.