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Fencer Vulns
medium 5.3

CVE-2021-33718 json

A vulnerability has been identified in Mendix Applications using Mendix 7 (All versions < V7.23.22), Mendix Applications using Mendix 8 (Al…

published 2021-07-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20395

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

A vulnerability has been identified in Mendix Applications using Mendix 7 (All versions < V7.23.22), Mendix Applications using Mendix 8 (All versions < V8.18.7), Mendix Applications using Mendix 9 (All versions < V9.3.0). Write access checks of attributes of an object could be bypassed, if user has a write permissions to the first attribute of this object.

Patch / fix

  • siemens mendix 7.23.22, 8.18.7, 9.3.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-194-16 updated cvss 5.3

Siemens Mendix

  • Siemens Mendix Applications using Mendix 7 <V7.23.22
    affected: fixed in V7.23.22, workaround docs.mendix.com
  • Siemens Mendix Applications using Mendix 8 <V8.18.7
    affected: fixed in V8.18.7, workaround docs.mendix.com
  • Siemens Mendix Applications using Mendix 9 <V9.3.0
    affected: fixed in V9.3.0, workaround docs.mendix.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N

Affected products

  • Siemens Mendix Applications using Mendix 7
  • Siemens Mendix Applications using Mendix 8
  • Siemens Mendix Applications using Mendix 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.