High severity7.8NVD Advisory· Published Aug 2, 2021· Updated Jun 17, 2026
CVE-2021-21865
CVE-2021-21865
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.
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Affected products
4cpe:2.3:a:codesys:development_system:3.5.16.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:codesys:development_system:3.5.16.0:*:*:*:*:*:*:*
- cpe:2.3:a:codesys:development_system:3.5.17.0:*:*:*:*:*:*:*
- (no CPE)range: 3.5.16
- CODESYS GmbH/CODESYS Development Systemdescription
Patches
Vulnerability mechanics
References
2- customers.codesys.com/index.phpnvdMitigationPatchVendor Advisory
- talosintelligence.com/vulnerability_reports/TALOS-2021-1301nvdNot ApplicableThird Party Advisory
News mentions
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