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

> Attackers can exploit an authentication bypass in Microsoft Exchange Server to gain elevated privileges on the mail server.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Yes, since 15 Feb 2024 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Feb 2024
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-mv5v-r4x4-qmxw

## What is CVE-2024-21410?

CVE-2024-21410 is a critical authentication bypass vulnerability in Microsoft Exchange Server, published on 13 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft Exchange Server Elevation of Privilege Vulnerability

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2024-21410?

It affects 1 product.


Products: Microsoft Exchange Server.

## How do I fix CVE-2024-21410?

No fix has been published for CVE-2024-21410 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 7 Mar 2024.

## Is CVE-2024-21410 being exploited?

Yes. Attackers have exploited CVE-2024-21410 in the wild since at least 15 Feb 2024.

Public exploit code:

- SentinelStream AI: A professional SIEM and SOAR platform featuring real-time threat correlation for CVE-2024-21410 and automated incident response logic. (github_poc): https://github.com/Piyush20004/SentinelStream-AI

## Other vulnerabilities in Microsoft Exchange Server

- [CVE-2021-34473](https://insights.sbomify.com/CVE-2021-34473/): Microsoft Exchange Server Remote Code Execution (critical 9.1, exploited in the wild)
- [CVE-2021-26855](https://insights.sbomify.com/CVE-2021-26855/): Microsoft Exchange Server Remote Code Execution (critical 9.1, exploited in the wild)
- [CVE-2021-34523](https://insights.sbomify.com/CVE-2021-34523/): Microsoft Exchange Server Privilege Escalation (critical 9.0, exploited in the wild)
- [CVE-2023-21529](https://insights.sbomify.com/CVE-2023-21529/): Microsoft Exchange Server Deserialization of Untrusted Data (high 8.8, exploited in the wild)
- [CVE-2022-41080](https://insights.sbomify.com/CVE-2022-41080/): Microsoft Exchange Server Privilege Escalation (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-21410 and fix it if it is affected.

What it is: CVE-2024-21410 is a critical authentication bypass vulnerability in Microsoft Exchange Server, published on 13 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2024-21410 in the wild since at least 15 Feb 2024.

Affected product: Microsoft Exchange Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-21410/ (Markdown: https://insights.sbomify.com/CVE-2024-21410/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21410
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-21410
- OSV: https://osv.dev/vulnerability/CVE-2024-21410

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-21410/
Summaries are generated and may contain mistakes; the official description above is the record.