CVE-2024-21378 Microsoft Outlook Remote Code Execution Vulnerability
Attackers can execute arbitrary code via Microsoft Outlook, requiring users to apply vendor patches immediately.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-21378?
CVE-2024-21378 is a high-severity code injection vulnerability in Microsoft 365 Apps, published on 13 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Microsoft Outlook Remote Code Execution Vulnerability
Weakness: CWE-94
Which versions are affected by CVE-2024-21378?
It affects 4 products.
Products include Microsoft 365 Apps, Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Outlook.
How do I fix CVE-2024-21378?
No fix has been published for CVE-2024-21378 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-2024-21378 being exploited?
There is no known exploitation of CVE-2024-21378 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
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-qm4q-xhjm-67jr.