How severe is CVE-2023-23396?

CVE-2023-23396 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-23396 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23396?

CVE-2023-23396 primarily affects Microsoft Office Online Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-23396?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-23396 published?

CVE-2023-23396 was published on 2023-03-14 and last updated on 2026-06-17.

CVE-2023-23396

CVE-2023-23396 is a medium-severity vulnerability in Microsoft Office Online Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Microsoft Office Online Server
Published: 2023-03-14
Last modified: 2026-06-17

Description

Microsoft Excel Denial of Service Vulnerability

Frequently asked questions

What is CVE-2023-23396?: Microsoft Excel Denial of Service Vulnerability
How severe is CVE-2023-23396?: CVE-2023-23396 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-23396 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23396?: CVE-2023-23396 primarily affects Microsoft Office Online Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-23396?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-23396 published?: CVE-2023-23396 was published on 2023-03-14 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:microsoft:office_online_server:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_web_apps_server:2013:sp1:*:*:*:*:*:*

More vulnerabilities in Microsoft Office Online Server

CVE-2023-21716 — Critical (CVSS 9.8): Microsoft Word Remote Code Execution Vulnerability
CVE-2019-1205 — Critical (CVSS 9.8): A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in…
CVE-2022-41106 — High (CVSS 8.8): Microsoft Excel Remote Code Execution Vulnerability
CVE-2022-21840 — High (CVSS 8.8): Microsoft Office Remote Code Execution Vulnerability
CVE-2020-1583 — High (CVSS 8.8): An information disclosure vulnerability exists when Microsoft Word improperly discloses the contents of its memory. An…
CVE-2020-1495 — High (CVSS 8.8): A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle…

All CVEs affecting Microsoft Office Online Server →

Other CWE-400 (Uncontrolled Resource Consumption) vulnerabilities

CVE-2026-46775 — Critical (CVSS 9.9): Vulnerability in Oracle REST Data Services (component: Core). Supported versions that are affected are 24.2.0-26.1.0.…
CVE-2025-61303 — Critical (CVSS 9.8): Hatching Triage Sandbox Windows 10 build 2004 (2025-08-14) and Windows 10 LTSC 2021(2025-08-14) contains a…
CVE-2025-43193 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6, macOS Sonoma 14.7.7,…
CVE-2025-24269 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4. An app may be able to…
CVE-2025-24264 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS 18.4,…
CVE-2025-24260 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4, macOS Sonoma 14.7.5,…

Browse all CWE-400 (Uncontrolled Resource Consumption) vulnerabilities →