# CVE-2024-21410: Microsoft Exchange Server Privilege Escalation Vulnerability

Source: https://junglewise.ai/threats/cve-2024-21410-microsoft-exchange-server-privilege-escalation-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-02-15. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2024-21410 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2024-02-15

Microsoft Exchange Server contains an elevation of privilege vulnerability due to improper authentication. The flaw allows a remote, unauthenticated attacker to escalate privileges on the system. This vulnerability has been confirmed to be exploited in the wild.

Technologies: [Microsoft Exchange Server](https://junglewise.ai/threats/technologies/exchange-server). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2024-21410 exploited in the wild?** Yes. CVE-2024-21410 is known to be exploited in the wild, first recorded on 15 February 2024. Treat it as urgent.

**How severe is CVE-2024-21410?** Critical severity, with a CVSS score of 9.8, published 15 February 2024.

**Which products and versions are affected?** Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Exchange Server 2019 Cumulative Update 13; Microsoft Exchange Server 2019 Cumulative Update 14.

**Is there a fix for CVE-2024-21410?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2024-21410 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2024-21410?** Check whether you run Microsoft Exchange Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft Exchange Server 2016 Cumulative Update 23
- Microsoft Exchange Server 2019 Cumulative Update 13
- Microsoft Exchange Server 2019 Cumulative Update 14

## Timeline

- 2024-02-13: disclosed: Initial disclosure by Microsoft Corporation
- 2024-02-15: kev added: Added to CISA's Known Exploited Vulnerabilities Catalog
- 2024-03-07: other: CISA due date for required mitigation action

## Related threats

- [Microsoft Exchange Server improper access control spoofing](https://junglewise.ai/threats/cve-2026-118208-improper-access-control-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server improper input validation code execution](https://junglewise.ai/threats/cve-2026-118207-improper-input-validation-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server weak authentication privilege elevation](https://junglewise.ai/threats/cve-2026-118157-weak-authentication-in-microsoft-exchange-server-allows-an)
- [Microsoft Exchange Server privilege elevation via untrusted security decision input](https://junglewise.ai/threats/cve-2026-118154-reliance-on-untrusted-inputs-in-a-security-decision-in-microsoft)
- [Microsoft Exchange Server algorithmic complexity denial of service](https://junglewise.ai/threats/cve-2026-118153-inefficient-algorithmic-complexity-in-microsoft-exchange-server)