VULNERABILITY INTELLIGENCE

CVE-2021-21865

CVSS score7.8 HIGH

EPSS probability1.39%

CISA KEVNot currently listed

Published2021-08-02

Last modified2026-06-17

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

Description

A unsafe deserialization vulnerability exists in the PackageManagement.plugin ExtensionMethods.Clone() functionality of CODESYS GmbH CODESYS Development System 3.5.16. A specially crafted file can lead to arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.

Weakness classification

talos-cna@cisco.com: CWE-502
nvd@nist.gov: CWE-502

Primary references

talos-cna@cisco.com — Mitigation, Patch, Vendor Advisory
talos-cna@cisco.com — Not Applicable, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mitigation, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Not Applicable, Third Party Advisory