How severe is CVE-2021-29239?

CVE-2021-29239 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-29239 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29239?

CVE-2021-29239 affects Codesys Development System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29239?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-29239 published?

CVE-2021-29239 was published on 2021-05-03 and last updated on 2026-06-17.

CVE-2021-29239

CVE-2021-29239 is a high-severity vulnerability in Codesys Development System with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Codesys Development System
Published: 2021-05-03
Last modified: 2026-06-17

Description

CODESYS Development System 3 before 3.5.17.0 displays or executes malicious documents or files embedded in libraries without first checking their validity.

Frequently asked questions

What is CVE-2021-29239?: CODESYS Development System 3 before 3.5.17.0 displays or executes malicious documents or files embedded in libraries without first checking their validity.
How severe is CVE-2021-29239?: CVE-2021-29239 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-29239 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29239?: CVE-2021-29239 affects Codesys Development System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29239?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-29239 published?: CVE-2021-29239 was published on 2021-05-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:codesys:development_system:*:*:*:*:*:*:*:*

More vulnerabilities in Codesys Development System

CVE-2019-9010 — Critical (CVSS 9.8): An issue was discovered in 3S-Smart CODESYS V3 products. The CODESYS Gateway does not correctly verify the ownership of…
CVE-2023-3663 — High (CVSS 8.8): In CODESYS Development System versions from 3.5.11.20 and before 3.5.19.20 a missing integrity check might allow an…
CVE-2022-4224 — High (CVSS 8.8): In multiple products of CODESYS v3 in multiple versions a remote low privileged user could utilize this vulnerability…
CVE-2019-9013 — High (CVSS 8.8): An issue was discovered in 3S-Smart CODESYS V3 products. The application may utilize non-TLS based encryption, which…
CVE-2022-22515 — High (CVSS 8.1): A remote, authenticated attacker could utilize the control program of the CODESYS Control runtime system to use the…
CVE-2026-44469 — High (CVSS 7.8): The affected product extracts installation files to a temporary directory with incorrect default permissions during…

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