How severe is CVE-2021-42025?

CVE-2021-42025 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-42025 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42025?

CVE-2021-42025 affects Mendix. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42025?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42025 published?

CVE-2021-42025 was published on 2021-11-09 and last updated on 2026-06-17.

CVE-2021-42025

CVE-2021-42025 is a medium-severity vulnerability in Mendix with a CVSS 3.x base score of 6.5. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.8
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Mendix
Published: 2021-11-09
Last modified: 2026-06-17

Description

A vulnerability has been identified in Mendix Applications using Mendix 8 (All versions < V8.18.13), Mendix Applications using Mendix 9 (All versions < V9.6.2). Applications built with affected versions of Mendix Studio Pro do not properly control write access for certain client actions. This could allow authenticated attackers to manipulate the content of System.FileDocument objects in some cases, regardless whether they have write access to it.

Frequently asked questions

What is CVE-2021-42025?: A vulnerability has been identified in Mendix Applications using Mendix 8 (All versions < V8.18.13), Mendix Applications using Mendix 9 (All versions < V9.6.2). Applications built with affected versions of Mendix Studio Pro do not properly control write access for certain client actions. This could allow authenticated attackers to manipulate the content of System.FileDocument objects in some cases, regardless whether they have write access to it.
How severe is CVE-2021-42025?: CVE-2021-42025 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-42025 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42025?: CVE-2021-42025 affects Mendix. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42025?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42025 published?: CVE-2021-42025 was published on 2021-11-09 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-779699.pdf

Affected products (1)

cpe:2.3:a:mendix:mendix:*:*:*:*:*:*:*:*

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