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CVE-2024-21402

20
FAUCET Score

CVE-2024-21402 is a Microsoft Outlook Elevation of Privilege vulnerability affecting Microsoft 365 Apps. With a CVSS score of 7.1 (High), it allows a local attacker with low privileges to achieve high confidentiality and integrity impact without user interaction. There is no evidence of active exploitation, nor is public exploit code available, though it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2401.17231.20236CPE matchmatch criteria
cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.48%
Probability of exploitation in next 30 days
EPSS Percentile
38.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0048 is in the 79th percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 (3)

microsoftpatch availablevia nvd_reference
View patch
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

Vendor Advisories (1)

microsoft2024-Feb/CVE-2024-21402Important

Microsoft Outlook Elevation of Privilege Vulnerability

Feb 13, 2024

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2024-21402
PatchVendor Advisory