Microsoft Outlook Remote Code Execution Vulnerability

Summary

CVE	CVE-2024-21413
State	PUBLISHED
Assigner	microsoft
Source Priority	CVE Program / NVD first with legacy fallback
Published	2024-02-13 18:16:00 UTC
Updated	2026-08-10 16:18:51 UTC
Description	Microsoft Outlook Remote Code Execution Vulnerability

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.946600000 probability, percentile 0.998530000 (date 2026-08-23)

CISA KEV: Listed on 2025-02-06; due 2025-02-27; ransomware use Unknown

Problem Types: CWE-20 | NVD-CWE-noinfo | CWE-20 CWE-20: Improper Input Validation

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	CVSS	9.8	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor	Microsoft
Product	Office Outlook
Name	Microsoft Outlook Improper Input Validation Vulnerability
Required Action	Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413 ; https://nvd.nist.gov/vuln/detail/CVE-2024-21413

Type	Vendor	Product	Version	Update	Edition	Language
Application	Microsoft	365 Apps	-	All	All	All
Application	Microsoft	Office 2016	-	All	All	All
Application	Microsoft	Office 2016	-	All	All	All
Application	Microsoft	Office 2019	-	All	All	All
Application	Microsoft	Office 2019	-	All	All	All
Application	Microsoft	Office Long Term Servicing Channel	2021	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Microsoft	Microsoft 365 Apps For Enterprise	affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom	32-bit Systems, x64-based Systems
CNA	Microsoft	Microsoft Office 2016	affected 16.0.0 16.0.5435.1001 custom	32-bit Systems, x64-based Systems
CNA	Microsoft	Microsoft Office 2019	affected 19.0.0 https://aka.ms/OfficeSecurityReleases custom	32-bit Systems, x64-based Systems
CNA	Microsoft	Microsoft Office LTSC 2021	affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom	32-bit Systems, x64-based Systems

Reference	Source	Link	Tags
www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerabil...	af854a3a-2127-422b-91ae-364da2661108	www.vicarius.io	Mitigation
msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413	af854a3a-2127-422b-91ae-364da2661108	msrc.microsoft.com	Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-an...	af854a3a-2127-422b-91ae-364da2661108	research.checkpoint.com	Technical Description
www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerabil...	af854a3a-2127-422b-91ae-364da2661108	www.vicarius.io	Exploit
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

No vendor comments have been submitted for this CVE.

Source	Time	Event
ADP	2025-02-06T00:00:00.000Z	CVE-2024-21413 added to CISA KEV

110458 Microsoft Office Remote Code Execution (RCE) Vulnerability for February 2024