CVE-2023-23396Network attack vector

Service interruption via undisclosed resource exhaustion

Published Mar 14, 2023 · Updated Feb 28, 2025

Resource exhaustion in Office Online Server and Office Web Apps Server 2013 allows remote attackers to interrupt service via unspecified vectors. Microsoft has not disclosed the Excel processing locus, the resource exhausted, or the operation on untrusted input that triggers consumption. User interaction is required, and the documented consequence is limited to loss of availability; Microsoft does not specify whether the service hangs or crashes.

CVSS severity6.5
Medium
EPSS probability3.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Office Online Server and Office Web Apps Server 2013 allows remote attackers to interrupt service via unspecified vectors. Microsoft has not disclosed the Excel processing locus, the resource exhausted, or the operation on untrusted input that triggers consumption. User interaction is required, and the documented consequence is limited to loss of availability; Microsoft does not specify whether the service hangs or crashes.

The record

CVE
CVE-2023-23396
Published
Mar 14, 2023
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft Office Online Server
Classifications
CWE-400
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.1 <16.0.10396.20000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Office Online Serverversion=16.0.1 <16.0.10396.20000
Microsoft · Microsoft Office Web Apps Server 2013version=15.0.1 <15.0.5537.1000

Published CVSS scores

6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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