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Full vulnerability report · 2021
CVE-2021-33718High confidence

Siemens Mendix Applications using Mendix 7 — Incorrect Authorization

Siemens · Mendix Applications using Mendix 7

5.3MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SSA-352521 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-352521: Access Check Bypass Vulnerability in Mendix
3 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • Mendix Applications using Mendix 7
  • Mendix Applications using Mendix 8
  • Mendix Applications using Mendix 9
Summary
Write access checks of attributes of an object could be bypassed, if user has a write permissions to the first attribute of this object.
Remediation
Update to V7.23.22 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-20395

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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.

What

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.

Why

The application performs an authorisation check, but it does not correctly enforce the required permission boundary.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The application performs an authorisation check, but it does not correctly enforce the required permission boundary.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Incorrect Authorization → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-863 ↗

CWE-863: Incorrect Authorization. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-863
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

CERT-FR · French · CERTFR-2021-AVI-518Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2021-31893 Référence CVE CVE-2021-31894 https://www.cve.org/CVERecord?id=CVE-2021-31894 Référence CVE CVE-2021-31895 https://www.cve.org/CVERecord?id=CVE-2021-31895 Référence CVE CVE-2021-33709 https://www.cve.org/CVERecord?id=CVE-2021-33709 Référence CVE CVE-2021-33710 https://www.cve.org/CVERecord?id=CVE-2021-33710 Référence CVE CVE-2021-33711 https://www.cve.org/CVERecord?id=CVE-2021-33711 Référence CVE CVE-2021-33713 https://www.cve.org/CVERecord?id=CVE-2021-33713 Référence CVE CVE-2021-33714 https://www.cve.org/CVERecord?id=CVE-2021-33714 Référence CVE CVE-2021-33715 https://www.cve.org/CVERecord?id=CVE-2021-33715 Référence CVE CVE-2021-33718 https://www.cve.org/CVERecord?id=CVE-2021-33718 Référence CVE CVE-2021-34291 https://www.cve.org/CVERecord?id=CVE-2021-34291 Référence CVE CVE-2021-34292 https://www.cve.org/CVERecord?id=CVE-2021-34292 Référence CVE CVE-2021-34293 https://www.cve.org/CVERecord?id=CVE-2021-34293 Référence CVE CVE-2021-34294 https://www.cve.org/CVERecord?id=CVE-2021-34294 Référence CVE CVE-2021-34295 https://www.cve.org/CVERecord?id=CVE-2021-34295 Référence CVE CVE-2021-34296 https://www.cve.org/CVERecord?id=CVE-2021-34296 Référence CVE CVE-2021-34297 https://www.cve.org/CVERecord?id=CVE-2021-34297 Référence CVE CVE-2021-34298 https://www.cve.org/CVERecord?id=

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Mendix Applications using Mendix 7; Mendix Applications using Mendix 8; Mendix Applications using Mendix 9
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
Update to V7.23.22 or later version
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 13 Jul 2021 · Last source change 3 Aug 2024, 23:58 UTC · CWE-863 · Incorrect Authorization

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-20395
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2021-20395↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-33718 · cve.blacktree.nl