Vulnerability-Lookup

CVE-2026-40411 (GCVE-0-2026-40411)

Vulnerability from cvelistv5 – Published: 2026-05-22 22:03 – Updated: 2026-05-22 22:03 Exclusively Hosted Service

Title

Azure Virtual Network Gateway Remote Code Execution Vulnerability

Summary

Improper input validation in Azure Virtual Network Gateway allows an authorized attacker to execute code over a network.

Severity ?

9.9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

CWE

CWE-20 - Improper Input Validation

Assigner

microsoft

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version
Microsoft	Azure Virtual Network Gateway	Affected: -

Date Public ?

2026-05-21 14:00

Show details on NVD website

JSON

To clipboard

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    "dateReserved": "2026-04-13T00:27:50.798Z",
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    "state": "PUBLISHED"
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      "percentile": "0.24571"
    }
  }
}

MSRC_CVE-2026-40411

Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-21 07:00

Summary

Azure Virtual Network Gateway Remote Code Execution Vulnerability

Severity

Critical

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Customer Action: Not required. The vulnerability documented by this CVE requires no customer action to resolve.

CVE-2026-40411

9.9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

CWE-20 - Improper Input Validation

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Azure Virtual Network Gateway		—

Threats

Impact Remote Code Execution

Exploit Status Publicly Disclosed:No;Exploited:No

References

7 references

URL	Category
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self
https://www.microsoft.com/en-us/msrc/exploitabili…	external
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self

Acknowledgments

Shay Shavit with Microsoft

JSON

To clipboard

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  "document": {
    "acknowledgments": [
      {
        "names": [
          "Shay Shavit with Microsoft"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
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        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
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        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
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        "title": "Customer Action"
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      "contact_details": "secure@microsoft.com",
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      },
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        "name": "Improper Input Validation"
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        },
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          "category": "faq",
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          "title": "Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?"
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          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40411.json"
        }
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            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "CHANGED",
            "temporalScore": 8.6,
            "userInteraction": "NONE",
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          "details": "Remote Code Execution"
        },
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          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No"
        }
      ],
      "title": "Azure Virtual Network Gateway Remote Code Execution Vulnerability"
    }
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-40411 (GCVE-0-2026-40411)

MSRC_CVE-2026-40411

Tags

Sightings

Nomenclature