# CVE-2000-0216: Denial of service in n/a

> Attackers can flood mail systems with automated responses by forging Read Receipt requests redirected to large distribution lists in Microsoft email clients.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Mar 2000
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-86fm-p2v6-q99m

## What is CVE-2000-0216?

CVE-2000-0216 is a medium-severity denial of service vulnerability in Microsoft Exchange Server, published on 22 Mar 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft email clients in Outlook, Exchange, and Windows Messaging automatically respond to Read Receipt and Delivery Receipt tags, which could allow an attacker to flood a mail system with responses by forging a Read Receipt request that is redirected to a large distribution list.

## Which versions are affected by CVE-2000-0216?

It affects 3 products.


Products: Microsoft Exchange Server, Microsoft Outlook, Microsoft Windows Messaging.

## How do I fix CVE-2000-0216?

No fix has been published for CVE-2000-0216 yet. Limit exposure of the affected software until one is available.

## Is CVE-2000-0216 being exploited?

There is no known exploitation of CVE-2000-0216 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Exchange Server

- [CVE-2024-21410](https://insights.sbomify.com/CVE-2024-21410/): Microsoft Exchange Server Privilege Escalation (critical 9.8, exploited in the wild)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2000-0216 and fix it if it is affected.

What it is: CVE-2000-0216 is a medium-severity denial of service vulnerability in Microsoft Exchange Server, published on 22 Mar 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2000-0216 in the wild and no public exploit code.

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-2000-0216/ (Markdown: https://insights.sbomify.com/CVE-2000-0216/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2000-0216
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2000-0216
- OSV: https://osv.dev/vulnerability/CVE-2000-0216

---
From sbomify Insights: https://insights.sbomify.com/CVE-2000-0216/
Summaries are generated and may contain mistakes; the official description above is the record.