#VU58058 Input validation error in Microsoft Office and Microsoft Excel - CVE-2021-42292

Vulnerability identifier: #VU58058

Vulnerability risk: Critical

CVSSv4.0: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2021-42292

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Excel
Client/Desktop applications / Office applications

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper input validation when processing Excel files. A remote attacker can create a specially crafted Excel file, trick the victim into opening it and execute arbitrary code on the system.

Note, the vulnerability is being exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2013 RT - 2013, 2016, 2019 for Mac - 2019

Microsoft Excel: 2013 RT Service Pack 1, 2013, 2016

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42292

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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?

Yes. This vulnerability is being exploited in the wild.