CVE-2024-21378

HIGH

Microsoft Outlook - Remote Code Execution

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2024-21378. PoCs published by d0rb.

AI-analyzed exploit summary The repository contains a functional Python script that exploits CVE-2024-21378 by sending a malicious COM DLL via a crafted email form to Microsoft Outlook, achieving remote code execution upon user interaction. The exploit leverages device code phishing for token acquisition and requires a COM-compliant DLL for payload delivery.

Description

Microsoft Outlook Remote Code Execution Vulnerability

Exploits (1)

nomisec WORKING POC 9 stars
by d0rb · poc
https://github.com/d0rb/CVE-2024-21378

The repository contains a functional Python script that exploits CVE-2024-21378 by sending a malicious COM DLL via a crafted email form to Microsoft Outlook, achieving remote code execution upon user interaction. The exploit leverages device code phishing for token acquisition and requires a COM-compliant DLL for payload delivery.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Outlook (Exchange Online)
Auth required
Prerequisites: Access token via device code phishing · COM-compliant malicious DLL · Target Outlook client interaction
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 8.8
EPSS 0.2731
EPSS Percentile 96.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-94
Status published
Products (4)
microsoft/365_apps
microsoft/office 2019
microsoft/office_long_term_servicing_channel 2021
microsoft/outlook 2016
Published Feb 13, 2024
Tracked Since Feb 18, 2026