What is CVE-2021-21865?

CVE-2021-21865 is a high-severity vulnerability in Codesys Development System, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2021-08-02.

How severe is CVE-2021-21865?

High severity. CVSS v3 base score is 7.8 out of 10.

Deserialization in Codesys Development System

CVE-2021-21865

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.013 (68.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Codesys Development_system — versions 3.5.16.0, 3.5.17.0
N/a Codesys — versions CODESYS GmbH CODESYS Development System 3.5.16

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

talos-cna@cisco.com (Third Party Advisory, x_refsource_MISC, Not Applicable)
talos-cna@cisco.com (x_refsource_CONFIRM, Patch, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2021-21865?: CVE-2021-21865 is a high-severity vulnerability in Codesys Development System, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2021-08-02.
How severe is CVE-2021-21865?: High severity. CVSS v3 base score is 7.8 out of 10.