---
title: "CVE-2024-21410: Microsoft Exchange Server Privilege Escalation Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-21410/
description: "CVE-2024-21410 (Microsoft Exchange Server): Exploited in the wild (CISA KEV). Microsoft Exchange Server Elevation of Privilege Vulnerability"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-02-13
date_modified: 2026-08-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-21410"
kev: true
cvss: 9.8
epss: 0.12561
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Exchange Server. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-02-15, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-03-07 ; treat that as the outer limit, not the target.
- EPSS 12.6% , percentile 96: FIRST’s model estimates a 12.6% chance of exploitation activity in the next 30 days, higher than 96% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

Microsoft Exchange Server Elevation of Privilege Vulnerability

## Affected products (CVE record)

- Microsoft Microsoft Exchange Server 2016 Cumulative Update 23: 15.01.0 < 15.01.2507.037
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 13: 15.02.0 < 15.2.1544.004
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 14: 15.02.0 < 15.2.1544.004

## Severity

- microsoft CVSS 3.1: 9.8 `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`

## Exploitation

- CISA KEV: added 2024-02-15; federal due date 2024-03-07. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 12.56% probability of exploitation activity in the next 30 days; percentile 96.

## Sources

- [Microsoft Exchange Server Elevation of Privilege Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21410)
- [CVE.org record CVE-2024-21410](https://www.cve.org/CVERecord?id=CVE-2024-21410)
- [NVD entry CVE-2024-21410](https://nvd.nist.gov/vuln/detail/CVE-2024-21410)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21410)

---
Source page: https://erroneo.us/security/cve/CVE-2024-21410/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt