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CVE-2024-21413

96
FAUCET Score

CVE-2024-21413 is a critical Remote Code Execution (RCE) vulnerability affecting Microsoft Outlook across various Office versions, including Microsoft 365 Apps and Office 2016/2019. With a CVSS score of 9.8, it presents a severe risk as it can be exploited remotely without user interaction, leading to complete compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited in the wild, as confirmed by its inclusion in CISA's KEV catalog, and has garnered significant community attention with numerous discussions and media coverage highlighting its ease of exploitation. While no public Metasploit or ExploitDB modules are available, the active exploitation and high FAUCET Risk Score of 100/100 underscore the immediate threat it poses.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
94.66%
Probability of exploitation in next 30 days
EPSS Percentile
99.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Feb 6, 2025
This CVE's current EPSS score of 0.9466 is in the 99th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 32-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 64-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft 365 Apps for Enterprise for 32-bit SystemsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft 365 Apps for Enterprise for 64-bit SystemsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office LTSC 2021 for 64-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office LTSC 2021 for 32-bit editionsFixed in: https://aka.ms/OfficeSecurityReleases
microsoftpatch availablevia msrc
Product: Microsoft Office 2016 (32-bit edition)Fixed in: 16.0.5435.1001
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2016 (32-bit edition)Fixed in: 16.0.5435.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2016 (64-bit edition)Fixed in: 16.0.5435.1001
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2016 (64-bit edition)Fixed in: 16.0.5435.1000
View patch

Vendor Advisories (1)

microsoft2024-Feb/CVE-2024-21413Critical

Microsoft Outlook Remote Code Execution Vulnerability

Feb 13, 2024

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
research.checkpoint.com / 2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture
Technical Description
vicarius.io / vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-script
Exploit
vicarius.io / vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-script
Mitigation
msrc.microsoft.com / update-guide/vulnerability/CVE-2024-21413
PatchVendor Advisory