CVE-2020-1240 Memory corruption in Microsoft 365 Apps for Enterprise for 32-bit Systems
Attackers can execute arbitrary code by exploiting a memory handling flaw in Microsoft Excel, requiring user interaction to open a malicious file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-1240?
CVE-2020-1240 is a high-severity memory corruption vulnerability in Microsoft 365 Apps, published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka 'Microsoft Excel Remote Code Execution Vulnerability'.
Which versions are affected by CVE-2020-1240?
It affects 1 product.
Products include Microsoft 365 Apps.
How do I fix CVE-2020-1240?
No fix has been published for CVE-2020-1240 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-1240 being exploited?
There is no known exploitation of CVE-2020-1240 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-m734-gp7q-qvrx.