CVE-2020-20136

PoC —

CVSS 3.1

9.8 critical

EPSS

2%p73

Published

Dec 14, 2020 (Dec 14, 2020)

Modified

Jun 17, 2026

Description

QuantConnect Lean versions from 2.3.0.0 to 2.4.0.1 are affected by an insecure deserialization vulnerability due to insecure configuration of TypeNameHandling property in Json.NET library.

Vendors: quantconnect
Products: lean
Weakness: CWE-502
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.5%)

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