CVE-2021-31177: Microsoft Excel XLS File Parsing Use-After-Free Remote Code Execution Vulnerability
First published: Tue May 11 2021(Updated: )
Microsoft Office Remote Code Execution Vulnerability
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Excel | ||
| Microsoft Office 2019 for 32-bit editions | ||
| Microsoft Excel 2013 | ||
| Microsoft Excel 2016 | ||
| Microsoft 365 Apps for Enterprise | ||
| Microsoft Office Web Apps Server 2013 | ||
| Microsoft 365 Apps for Enterprise | ||
| Microsoft Office 2019 for Mac | ||
| Microsoft Excel 2013 | ||
| Microsoft Office 2019 for 64-bit editions | ||
| Microsoft Excel 2013 RT | ||
| Microsoft Excel 2016 | ||
| Microsoft Office Online Server | ||
| Microsoft 365 Apps | ||
| Microsoft Excel | =2013-sp1 | |
| Microsoft Excel | =2013-sp1 | |
| Microsoft Excel | =2016 | |
| Microsoft Office | =2013-sp1 | |
| Microsoft Office | =2013-sp1 | |
| Microsoft Office | =2016 | |
| Microsoft Office | =2019 | |
| Microsoft Office Online Server | ||
| Microsoft Office Web Apps Server | =2013-sp1 | |
| Microsoft Word | =2013-sp1 | |
| Microsoft Word | =2013-sp1 | |
| Microsoft Word | =2016 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-31177?
CVE-2021-31177 is a vulnerability that allows remote attackers to execute arbitrary code on affected installations of Microsoft Excel.
How severe is CVE-2021-31177?
CVE-2021-31177 has a severity rating of 7.8, which is considered high.
Which software products are affected by CVE-2021-31177?
Microsoft Excel 2013, Excel 2013 RT, Office Web Apps Server 2013, Excel 2016, Excel 2013 64-bit, Microsoft Office 365 Apps for Enterprise, Microsoft Office 2019, Office 2019 for Mac, and Office Online Server are affected by CVE-2021-31177.
Is user interaction required to exploit CVE-2021-31177?
Yes, user interaction is required to exploit CVE-2021-31177. The target must visit a malicious page or open a malicious file.
How can I fix CVE-2021-31177?
To fix CVE-2021-31177, you should apply the relevant patches or updates provided by Microsoft for the affected software.
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- canonical/microsoft office 2019 for 32-bit editions
- canonical/microsoft excel 2013
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- canonical/microsoft 365 apps for enterprise
- canonical/microsoft office web apps server 2013
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- canonical/microsoft office 2019 for 64-bit editions
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- canonical/microsoft office web apps server
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- canonical/microsoft word
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