What’s Vulnerable › Vulnerabilities

CVE-2023-23396: Microsoft Excel Denial of Service Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-14 · updated 2026-06-17
• Weakness: CWE-400

Description

Microsoft Excel Denial of Service Vulnerability

Affected products

• Microsoft Office Online Server: all versions
• Microsoft Office Web Apps Server: 2013-sp1
• Microsoft Office Web Apps Server 2013 Service Pack 1: from 15.0.1 before 15.0.5537.1000 — fixed in 15.0.5537.1000
• Microsoft Office Online Server: from 16.0.1 before 16.0.10396.20000 — fixed in 16.0.10396.20000

How to fix

Upgrade to a fixed version: Microsoft Office Web Apps Server 2013 Service Pack 1 15.0.5537.1000; Microsoft Office Online Server 16.0.10396.20000. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23396
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23396

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