CVE-2021-21864

HIGH

Codesys Development System - Insecure Deserialization

Title source: rule

Description

A unsafe deserialization vulnerability exists in the ComponentModel ComponentManager.StartupCultureSettings functionality of CODESYS GmbH CODESYS Development System 3.5.16 and 3.5.17. A specially crafted file can lead to arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.

References (2)

[Mitigation, Patch, Vendor Advisory] https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16805&token=ee583c498941d9fda86490bca98ff21928eec08a&download=

[Exploit, Third Party Advisory] https://talosintelligence.com/vulnerability_reports/TALOS-2021-1301

Scores

CVSS v3 7.8

EPSS 0.0009

EPSS Percentile 25.7%

Attack Vector LOCAL

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

Classification

CWE

CWE-502

Status published

Affected Products (2)

codesys/development_system

Timeline

Published Aug 02, 2021

Tracked Since Feb 18, 2026