Vulnerability identifier: #VU86482

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-21379

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Word
Client/Desktop applications / Office applications
Microsoft 365 Apps for Enterprise
Client/Desktop applications / Office applications
Microsoft Office LTSC 2021
Other software / Other software solutions

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing PDF files with Microsoft Word. A remote attacker can create a specially crafted PDF file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2019

Microsoft Word:

Microsoft Office LTSC 2021: 32 bit editions - 64 bit editions

Microsoft 365 Apps for Enterprise:

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External links
http://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21379
http://www.zerodayinitiative.com/advisories/ZDI-24-164/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.