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Fencer Intel
high 8.8

CVE-2021-27394 json

A vulnerability has been identified in Mendix Applications using Mendix 7 (All versions < V7.23.19), Mendix Applications using Mendix 8 (Al…

published 5y ago modified 4mo ago also EUVD-2021-14149

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

A vulnerability has been identified in Mendix Applications using Mendix 7 (All versions < V7.23.19), Mendix Applications using Mendix 8 (All versions < V8.17.0), Mendix Applications using Mendix 8 (V8.12) (All versions < V8.12.5), Mendix Applications using Mendix 8 (V8.6) (All versions < V8.6.9), Mendix Applications using Mendix 9 (All versions < V9.0.5). Authenticated, non-administrative users could modify their privileges by manipulating the user role under certain circumstances, allowing them to gain administrative privileges.

Patch / fix

  • mendix mendix 7.23.19, 8.6.9, 8.12.5, 8.17.0, 9.0.5

Is CVE-2021-27394 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

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

cisa ICSA-21-110-07 updated cvss 8.1

Siemens Mendix

  • Siemens Mendix Applications using Mendix 7 <V7.23.19
    affected: fixed in V7.23.19, mitigation docs.mendix.com
  • Siemens Mendix Applications using Mendix 8 <V8.17.0
    affected: fixed in V8.17.0, mitigation docs.mendix.com
  • Siemens Mendix Applications using Mendix 8 (V8.6) <V8.6.9
    affected: fixed in V8.6.9, mitigation docs.mendix.com
  • Siemens Mendix Applications using Mendix 8 (V8.12) <V8.12.5
    affected: fixed in V8.12.5, mitigation docs.mendix.com
  • Siemens Mendix Applications using Mendix 9 <V9.0.5
    affected: fixed in V9.0.5, mitigation 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

1.42% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • Siemens Mendix Applications using Mendix 7
  • Siemens Mendix Applications using Mendix 8
  • Siemens Mendix Applications using Mendix 8 (V8.12)
  • Siemens Mendix Applications using Mendix 8 (V8.6)
  • Siemens Mendix Applications using Mendix 9

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Intel 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.