CVE-2021-31939 Microsoft Excel Remote Code Execution Vulnerability
Attackers can execute arbitrary code by tricking users into opening a specially crafted Microsoft Excel file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-31939?
CVE-2021-31939 is a high-severity code injection vulnerability in Microsoft 365 Apps, published on 8 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Microsoft Excel Remote Code Execution Vulnerability
Which versions are affected by CVE-2021-31939?
It affects 5 products.
Products include Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office Online Server, Microsoft Office Web Apps Server.
How do I fix CVE-2021-31939?
No fix has been published for CVE-2021-31939 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-31939 being exploited?
There is no known exploitation of CVE-2021-31939 in the wild and no public exploit code.
Other vulnerabilities in Microsoft 365 Apps
- CVE-2024-21413 Microsoft Outlook Improper Input Validation
- CVE-2023-23397 Microsoft Office Outlook Privilege Escalation
- CVE-2024-38189 Microsoft Project Remote Code Execution Vulnerability
- CVE-2023-35311 Microsoft Outlook Security Feature Bypass
- CVE-2026-21514 Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision
Sources
Also known as GHSA-3w8p-33h3-h7v6.