CVE-2024-21378
Microsoft Outlook Remote Code Execution Vulnerability
- Published
- Feb 13, 2024
- Updated
- Aug 10, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HModerate · next 30 days
- Percentile
- 95.9%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Microsoft Outlook Remote Code Execution Vulnerability
Sources
This repository contains an exploit for targeting Microsoft Outlook through Exchange Online, leveraging a vulnerability to execute arbitrary code via COM DLLs. The exploit utilizes a modified version of Ruler to send a malicious form as an email, triggering the execution upon user interaction within the Outlook thick client.
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.