Critical 9.8Known exploited (CISA KEV)Published Feb 13, 2024

CVE-2024-21410Microsoft Exchange Server Elevation of Privilege Vulnerability

Updated under an hour ago (Oct 28, 2026, 9:10 AM ET)

Does this affect you?

It affects Microsoft Exchange Server 2016 Cumulative Update 23 and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Feb 15, 2024; federal agencies had to remediate by Mar 7, 2024. Treat that date as your deadline.

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Every CVE for Microsoft Exchange Server 2016 Cumulative Update 23

Exploited in the last 30 days

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Weakness (CWE): CWE-287
Known exploited: Added to CISA KEV Feb 15, 2024; federal remediation due Mar 7, 2024Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 12.66% (percentile 96)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Aug 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 microsoft:exchange_server_2016_cumulative_update_23 (from the name)	from 15.01.0 before 15.01.2507.037	CNA record
Microsoft Microsoft Exchange Server 2019 Cumulative Update 13 microsoft:exchange_server_2019_cumulative_update_13 (from the name)	from 15.02.0 before 15.2.1544.004	CNA record
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 microsoft:exchange_server_2019_cumulative_update_14 (from the name)	from 15.02.0 before 15.2.1544.004	CNA record
microsoft exchange_server microsoft:exchange_server	2016; 2019; 2019	NVD

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21410	vendor-advisory, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21410	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.