CVE-2024-21410
CriticalExploitedPublic exploitMicrosoft Exchange Server Elevation of Privilege Vulnerability
Published Feb 16, 2024 · Updated Aug 10, 2026
Key Facts
Patch immediately- CVE-2024-21410 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Exchange Server (Microsoft), Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 13 and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 14, 2024. Public exploit code is available.
- EPSS estimates a 13% probability of exploitation in the next 30 days.
- Fixed versions are available, including Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.037, Microsoft Exchange Server 2019 Cumulative Update 13 15.2.1544.004, Microsoft Exchange Server 2019 Cumulative Update 14 15.2.1544.004.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
13%
Higher than 96.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-21410 brief as a PDF
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Description
Microsoft Exchange Server Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 15, 2024 | Mar 7, 2024 | Not reported |
| Industry KEV feed | Feb 14, 2024 | Mar 7, 2024 | Not reported |
| CIRCL KEV | Feb 15, 2024 | Mar 7, 2024 | Not reported |
| ENISA EUVD | Feb 15, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Exchange ServerMicrosoft | 2016-cumulative_update_23, 2019-cumulative_update_13, 2019-cumulative_update_14 | n/a |
| Microsoft Exchange Server 2016 Cumulative Update 23 | >= 15.01.0 | 15.01.2507.037 |
| Microsoft Exchange Server 2019 Cumulative Update 13 | >= 15.02.0 | 15.2.1544.004 |
| Microsoft Exchange Server 2019 Cumulative Update 14 | >= 15.02.0 | 15.2.1544.004 |
Patched Releases
Microsoft Exchange Server 2016 Cumulative Update 23
15.01.2507.037
Microsoft Exchange Server 2019 Cumulative Update 13
15.2.1544.004
Microsoft Exchange Server 2019 Cumulative Update 14
15.2.1544.004
Timeline
Added to Industry KEV feed
Feb 14, 2024
Added to CISA KEV
Feb 15, 2024
Added to CIRCL KEV
Feb 15, 2024
Added to ENISA EUVD
Feb 15, 2024
Publicly disclosed
Feb 16, 2024
Last updated
Aug 10, 2026
Weakness Type
- CWE-287 Improper Authentication
References
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20673
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20684
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21315
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21327
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
FAQ
Common Questions.
Microsoft Exchange Server Elevation of Privilege Vulnerability
Affected: Exchange Server (Microsoft) versions 2016-cumulative_update_23, 2019-cumulative_update_13, 2019-cumulative_update_14; Microsoft Exchange Server 2016 Cumulative Update 23 versions >= 15.01.0; Microsoft Exchange Server 2019 Cumulative Update 13 versions >= 15.02.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 14, 2024.
Yes. It was added on Feb 15, 2024 with a federal remediation due date of Mar 7, 2024.
Public exploit code is available.
Fixed versions are available, including Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.037, Microsoft Exchange Server 2019 Cumulative Update 13 15.2.1544.004, Microsoft Exchange Server 2019 Cumulative Update 14 15.2.1544.004.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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