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High severity7.8NVD Advisory· Published Aug 18, 2021· Updated Jun 17, 2026

CVE-2021-21867

CVE-2021-21867

Description

An unsafe deserialization vulnerability exists in the ObjectManager.plugin ObjectStream.ProfileByteArray 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

4
  • Codesys/Codesys2 versions
    cpe:2.3:a:codesys:codesys:3.5.16.0:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:codesys:codesys:3.5.16.0:*:*:*:*:*:*:*
    • cpe:2.3:a:codesys:codesys:3.5.17.0:*:*:*:*:*:*:*
  • CODESYS GmbH/CODESYS Development Systemdescription
  • Codesys/Development Systemllm-fuzzy
    Range: 3.5.16, 3.5.17

Patches

Vulnerability mechanics

References

2

News mentions

0

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