CVE-2024-49029

Code execution via uninitialized resource use

Published Nov 12, 2024 · Updated Jul 8, 2025

Use of an uninitialized resource in Microsoft Excel allows attackers to execute code when a user opens a crafted workbook. Microsoft identifies the weakness in Excel but has not disclosed the affected parser or function, or how workbook data causes the resource to be used before initialization. Exploitation requires user interaction, and successful code runs with the privileges of the user who opens the file.

CVSS severity7.8
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized resource in Microsoft Excel allows attackers to execute code when a user opens a crafted workbook. Microsoft identifies the weakness in Excel but has not disclosed the affected parser or function, or how workbook data causes the resource to be used before initialization. Exploitation requires user interaction, and successful code runs with the privileges of the user who opens the file.

The record

CVE
CVE-2024-49029
Published
Nov 12, 2024
Updated
Jul 8, 2025
Vendor
Microsoft
Product
Microsoft Office LTSC for Mac 2024
Classifications
CWE-908, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=1.0.0 <16.91.24111020

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Office LTSC for Mac 2024version=1.0.0 <16.91.24111020
Microsoft · Microsoft Office 2019version=19.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Excel 2016version=16.0.0.0 <16.0.5474.1001
Microsoft · Microsoft Office LTSC for Mac 2021version=16.0.1 <16.91.24111020
Microsoft · Microsoft Office LTSC 2021version=16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office LTSC 2024version=1.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1204.002Malicious File
T1203Exploitation for Client Execution

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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